fidl_fuchsia_metrics__common/

fidl_fuchsia_metrics__common.rs

// WARNING: This file is machine generated by fidlgen.

#![warn(clippy::all)]
#![allow(unused_parens, unused_mut, unused_imports, nonstandard_style)]

use bitflags::bitflags;
use fidl::encoding::{MessageBufFor, ProxyChannelBox, ResourceDialect};
use futures::future::{self, MaybeDone, TryFutureExt};
use zx_status;

/// A vector of event codes. When used in one of the Log*() calls below,
/// there must be one event code for each dimension of the metric whose
/// metric_id is supplied, or else the call will return INVALID_ARGUMENTS.
pub type EventVector = Vec<u32>;

/// A histogram that assigns a count to each of several integer ranges.
/// To save space/memory/bandwidth, each bucket index should only be included
/// once, and empty buckets should not be included. The order of the vector
/// is immaterial.
pub type IntegerHistogram = Vec<HistogramBucket>;

/// Maximum number of events that may be logged in a single FIDL call.
pub const MAX_BATCHED_EVENTS: u32 = 500;

/// The maximum size of a single Event is 100 KB.
pub const MAX_BYTES_PER_EVENT: i64 = 102400;

/// Maximum number of experiment ids that can be provided to a single logger.
pub const MAX_EXPERIMENT_IDS: u32 = 100;

/// This is intended as a reasonable maximum number of histogram buckets per
/// event.
pub const MAX_HISTOGRAM_BUCKETS: u32 = 500;

/// Maximum number of event codes that can be associated with a single event.
pub const MAX_METRIC_DIMENSIONS: u32 = 10;

/// String events should not be longer than this.
pub const MAX_STRING_EVENT_SIZE: u32 = 256;

/// Error codes for MetricEventLogger operations.
#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, Hash)]
#[repr(i32)]
pub enum Error {
    /// For example, the supplied metric id is invalid.
    InvalidArguments = 1,
    /// An attempt was made to log an Event whose serialized size exceeds
    /// MAX_BYTES_PER_EVENT.
    EventTooBig = 2,
    /// The logger's local buffer is temporarily full and cannot handle any more
    /// Events at this time. Try again later. This condition should be rare.
    BufferFull = 3,
    ShutDown = 4,
    /// Catch-all for unexpected errors.
    InternalError = -1,
}

impl Error {
    #[inline]
    pub fn from_primitive(prim: i32) -> Option<Self> {
        match prim {
            1 => Some(Self::InvalidArguments),
            2 => Some(Self::EventTooBig),
            3 => Some(Self::BufferFull),
            4 => Some(Self::ShutDown),
            -1 => Some(Self::InternalError),
            _ => None,
        }
    }

    #[inline]
    pub const fn into_primitive(self) -> i32 {
        self as i32
    }
}

/// One bucket of a histogram, used by the method LogIntegerHistogram.
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
#[repr(C)]
pub struct HistogramBucket {
    /// The index of the bucket. The metric includes a specification
    /// of a sequence of N+1 integer-range buckets that are indexed from
    /// 0, the underflow bucket, to N, the overflow bucket.
    pub index: u32,
    /// The number of values in that bucket.
    /// To save space/memory/bandwidth, empty buckets should not be included.
    pub count: u64,
}

impl fidl::Persistable for HistogramBucket {}

/// A specification of an event that occurred to be passed to LogMetricEvents().
#[derive(Clone, Debug, PartialEq)]
pub struct MetricEvent {
    /// ID of the metric being logged.
    pub metric_id: u32,
    /// `event_codes` Ordered list of parameters, one for each of the metric's
    /// dimensions.
    pub event_codes: Vec<u32>,
    /// The metric-type-specific data for the event being logged.
    pub payload: MetricEventPayload,
}

impl fidl::Persistable for MetricEvent {}

#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct MetricEventLoggerLogIntegerHistogramRequest {
    pub metric_id: u32,
    pub histogram: Vec<HistogramBucket>,
    pub event_codes: Vec<u32>,
}

impl fidl::Persistable for MetricEventLoggerLogIntegerHistogramRequest {}

#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct MetricEventLoggerLogIntegerRequest {
    pub metric_id: u32,
    pub value: i64,
    pub event_codes: Vec<u32>,
}

impl fidl::Persistable for MetricEventLoggerLogIntegerRequest {}

#[derive(Clone, Debug, PartialEq)]
pub struct MetricEventLoggerLogMetricEventsRequest {
    pub events: Vec<MetricEvent>,
}

impl fidl::Persistable for MetricEventLoggerLogMetricEventsRequest {}

#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct MetricEventLoggerLogOccurrenceRequest {
    pub metric_id: u32,
    pub count: u64,
    pub event_codes: Vec<u32>,
}

impl fidl::Persistable for MetricEventLoggerLogOccurrenceRequest {}

#[derive(Clone, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct MetricEventLoggerLogStringRequest {
    pub metric_id: u32,
    pub string_value: String,
    pub event_codes: Vec<u32>,
}

impl fidl::Persistable for MetricEventLoggerLogStringRequest {}

/// A specification identifying a project to log events for.
#[derive(Clone, Debug, Default, PartialEq)]
pub struct ProjectSpec {
    /// The customer ID. If omitted (i.e. set to 0) then it defaults to the
    /// customer ID for the default "fuchsia" customer.
    pub customer_id: Option<u32>,
    /// The ID of the project.
    pub project_id: Option<u32>,
    #[doc(hidden)]
    pub __source_breaking: fidl::marker::SourceBreaking,
}

impl fidl::Persistable for ProjectSpec {}

/// The variadic part of a MetricEvent.
#[derive(Clone, Debug)]
pub enum MetricEventPayload {
    /// The number of times the event has occurred, see LogOccurrence().
    Count(u64),
    /// The integer measured, see LogInteger().
    IntegerValue(i64),
    /// The collection of approximate integer measurements, see
    /// LogIntegerHistogram().
    Histogram(Vec<HistogramBucket>),
    /// The string to log, see LogString().
    StringValue(String),
    #[doc(hidden)]
    __SourceBreaking { unknown_ordinal: u64 },
}

/// Pattern that matches an unknown `MetricEventPayload` member.
#[macro_export]
macro_rules! MetricEventPayloadUnknown {
    () => {
        _
    };
}

// Custom PartialEq so that unknown variants are not equal to themselves.
impl PartialEq for MetricEventPayload {
    fn eq(&self, other: &Self) -> bool {
        match (self, other) {
            (Self::Count(x), Self::Count(y)) => *x == *y,
            (Self::IntegerValue(x), Self::IntegerValue(y)) => *x == *y,
            (Self::Histogram(x), Self::Histogram(y)) => *x == *y,
            (Self::StringValue(x), Self::StringValue(y)) => *x == *y,
            _ => false,
        }
    }
}

impl MetricEventPayload {
    #[inline]
    pub fn ordinal(&self) -> u64 {
        match *self {
            Self::Count(_) => 1,
            Self::IntegerValue(_) => 2,
            Self::Histogram(_) => 3,
            Self::StringValue(_) => 4,
            Self::__SourceBreaking { unknown_ordinal } => unknown_ordinal,
        }
    }

    #[inline]
    pub fn unknown_variant_for_testing() -> Self {
        Self::__SourceBreaking { unknown_ordinal: 0 }
    }

    #[inline]
    pub fn is_unknown(&self) -> bool {
        match self {
            Self::__SourceBreaking { .. } => true,
            _ => false,
        }
    }
}

impl fidl::Persistable for MetricEventPayload {}

mod internal {
    use super::*;
    unsafe impl fidl::encoding::TypeMarker for Error {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            std::mem::align_of::<i32>()
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            std::mem::size_of::<i32>()
        }

        #[inline(always)]
        fn encode_is_copy() -> bool {
            true
        }

        #[inline(always)]
        fn decode_is_copy() -> bool {
            false
        }
    }

    impl fidl::encoding::ValueTypeMarker for Error {
        type Borrowed<'a> = Self;
        #[inline(always)]
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            *value
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<Self, D> for Error {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<Self>(offset);
            encoder.write_num(self.into_primitive(), offset);
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for Error {
        #[inline(always)]
        fn new_empty() -> Self {
            Self::InternalError
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            let prim = decoder.read_num::<i32>(offset);

            *self = Self::from_primitive(prim).ok_or(fidl::Error::InvalidEnumValue)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for HistogramBucket {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for HistogramBucket {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            16
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<HistogramBucket, D>
        for &HistogramBucket
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<HistogramBucket>(offset);
            unsafe {
                // Copy the object into the buffer.
                let buf_ptr = encoder.buf.as_mut_ptr().add(offset);
                (buf_ptr as *mut HistogramBucket)
                    .write_unaligned((self as *const HistogramBucket).read());
                // Zero out padding regions. Unlike `fidl_struct_impl_noncopy!`, this must be
                // done second because the memcpy will write garbage to these bytes.
                let padding_ptr = buf_ptr.offset(0) as *mut u64;
                let padding_mask = 0xffffffff00000000u64;
                padding_ptr.write_unaligned(padding_ptr.read_unaligned() & !padding_mask);
            }
            Ok(())
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<u32, D>,
            T1: fidl::encoding::Encode<u64, D>,
        > fidl::encoding::Encode<HistogramBucket, D> for (T0, T1)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<HistogramBucket>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for HistogramBucket {
        #[inline(always)]
        fn new_empty() -> Self {
            Self { index: fidl::new_empty!(u32, D), count: fidl::new_empty!(u64, D) }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            let buf_ptr = unsafe { decoder.buf.as_ptr().add(offset) };
            // Verify that padding bytes are zero.
            let ptr = unsafe { buf_ptr.offset(0) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            // Copy from the buffer into the object.
            unsafe {
                std::ptr::copy_nonoverlapping(buf_ptr, self as *mut Self as *mut u8, 16);
            }
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEvent {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEvent {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            40
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<MetricEvent, D>
        for &MetricEvent
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEvent>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<MetricEvent, D>::encode(
                (
                    <u32 as fidl::encoding::ValueTypeMarker>::borrow(&self.metric_id),
                    <fidl::encoding::Vector<u32, 10> as fidl::encoding::ValueTypeMarker>::borrow(
                        &self.event_codes,
                    ),
                    <MetricEventPayload as fidl::encoding::ValueTypeMarker>::borrow(&self.payload),
                ),
                encoder,
                offset,
                _depth,
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<u32, D>,
            T1: fidl::encoding::Encode<fidl::encoding::Vector<u32, 10>, D>,
            T2: fidl::encoding::Encode<MetricEventPayload, D>,
        > fidl::encoding::Encode<MetricEvent, D> for (T0, T1, T2)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEvent>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            self.2.encode(encoder, offset + 24, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for MetricEvent {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                metric_id: fidl::new_empty!(u32, D),
                event_codes: fidl::new_empty!(fidl::encoding::Vector<u32, 10>, D),
                payload: fidl::new_empty!(MetricEventPayload, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(0) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(u32, D, &mut self.metric_id, decoder, offset + 0, _depth)?;
            fidl::decode!(fidl::encoding::Vector<u32, 10>, D, &mut self.event_codes, decoder, offset + 8, _depth)?;
            fidl::decode!(MetricEventPayload, D, &mut self.payload, decoder, offset + 24, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEventLoggerLogIntegerHistogramRequest {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEventLoggerLogIntegerHistogramRequest {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            40
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect>
        fidl::encoding::Encode<MetricEventLoggerLogIntegerHistogramRequest, D>
        for &MetricEventLoggerLogIntegerHistogramRequest
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogIntegerHistogramRequest>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<MetricEventLoggerLogIntegerHistogramRequest, D>::encode(
                (
                    <u32 as fidl::encoding::ValueTypeMarker>::borrow(&self.metric_id),
                    <fidl::encoding::Vector<HistogramBucket, 500> as fidl::encoding::ValueTypeMarker>::borrow(&self.histogram),
                    <fidl::encoding::Vector<u32, 10> as fidl::encoding::ValueTypeMarker>::borrow(&self.event_codes),
                ),
                encoder, offset, _depth
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<u32, D>,
            T1: fidl::encoding::Encode<fidl::encoding::Vector<HistogramBucket, 500>, D>,
            T2: fidl::encoding::Encode<fidl::encoding::Vector<u32, 10>, D>,
        > fidl::encoding::Encode<MetricEventLoggerLogIntegerHistogramRequest, D> for (T0, T1, T2)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogIntegerHistogramRequest>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            self.2.encode(encoder, offset + 24, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D>
        for MetricEventLoggerLogIntegerHistogramRequest
    {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                metric_id: fidl::new_empty!(u32, D),
                histogram: fidl::new_empty!(fidl::encoding::Vector<HistogramBucket, 500>, D),
                event_codes: fidl::new_empty!(fidl::encoding::Vector<u32, 10>, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(0) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(u32, D, &mut self.metric_id, decoder, offset + 0, _depth)?;
            fidl::decode!(fidl::encoding::Vector<HistogramBucket, 500>, D, &mut self.histogram, decoder, offset + 8, _depth)?;
            fidl::decode!(fidl::encoding::Vector<u32, 10>, D, &mut self.event_codes, decoder, offset + 24, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEventLoggerLogIntegerRequest {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEventLoggerLogIntegerRequest {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            32
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect>
        fidl::encoding::Encode<MetricEventLoggerLogIntegerRequest, D>
        for &MetricEventLoggerLogIntegerRequest
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogIntegerRequest>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<MetricEventLoggerLogIntegerRequest, D>::encode(
                (
                    <u32 as fidl::encoding::ValueTypeMarker>::borrow(&self.metric_id),
                    <i64 as fidl::encoding::ValueTypeMarker>::borrow(&self.value),
                    <fidl::encoding::Vector<u32, 10> as fidl::encoding::ValueTypeMarker>::borrow(
                        &self.event_codes,
                    ),
                ),
                encoder,
                offset,
                _depth,
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<u32, D>,
            T1: fidl::encoding::Encode<i64, D>,
            T2: fidl::encoding::Encode<fidl::encoding::Vector<u32, 10>, D>,
        > fidl::encoding::Encode<MetricEventLoggerLogIntegerRequest, D> for (T0, T1, T2)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogIntegerRequest>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            self.2.encode(encoder, offset + 16, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D>
        for MetricEventLoggerLogIntegerRequest
    {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                metric_id: fidl::new_empty!(u32, D),
                value: fidl::new_empty!(i64, D),
                event_codes: fidl::new_empty!(fidl::encoding::Vector<u32, 10>, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(0) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(u32, D, &mut self.metric_id, decoder, offset + 0, _depth)?;
            fidl::decode!(i64, D, &mut self.value, decoder, offset + 8, _depth)?;
            fidl::decode!(fidl::encoding::Vector<u32, 10>, D, &mut self.event_codes, decoder, offset + 16, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEventLoggerLogMetricEventsRequest {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEventLoggerLogMetricEventsRequest {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            16
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect>
        fidl::encoding::Encode<MetricEventLoggerLogMetricEventsRequest, D>
        for &MetricEventLoggerLogMetricEventsRequest
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogMetricEventsRequest>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<MetricEventLoggerLogMetricEventsRequest, D>::encode(
                (
                    <fidl::encoding::Vector<MetricEvent, 500> as fidl::encoding::ValueTypeMarker>::borrow(&self.events),
                ),
                encoder, offset, _depth
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<fidl::encoding::Vector<MetricEvent, 500>, D>,
        > fidl::encoding::Encode<MetricEventLoggerLogMetricEventsRequest, D> for (T0,)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogMetricEventsRequest>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D>
        for MetricEventLoggerLogMetricEventsRequest
    {
        #[inline(always)]
        fn new_empty() -> Self {
            Self { events: fidl::new_empty!(fidl::encoding::Vector<MetricEvent, 500>, D) }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            fidl::decode!(fidl::encoding::Vector<MetricEvent, 500>, D, &mut self.events, decoder, offset + 0, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEventLoggerLogOccurrenceRequest {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEventLoggerLogOccurrenceRequest {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            32
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect>
        fidl::encoding::Encode<MetricEventLoggerLogOccurrenceRequest, D>
        for &MetricEventLoggerLogOccurrenceRequest
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogOccurrenceRequest>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<MetricEventLoggerLogOccurrenceRequest, D>::encode(
                (
                    <u32 as fidl::encoding::ValueTypeMarker>::borrow(&self.metric_id),
                    <u64 as fidl::encoding::ValueTypeMarker>::borrow(&self.count),
                    <fidl::encoding::Vector<u32, 10> as fidl::encoding::ValueTypeMarker>::borrow(
                        &self.event_codes,
                    ),
                ),
                encoder,
                offset,
                _depth,
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<u32, D>,
            T1: fidl::encoding::Encode<u64, D>,
            T2: fidl::encoding::Encode<fidl::encoding::Vector<u32, 10>, D>,
        > fidl::encoding::Encode<MetricEventLoggerLogOccurrenceRequest, D> for (T0, T1, T2)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogOccurrenceRequest>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            self.2.encode(encoder, offset + 16, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D>
        for MetricEventLoggerLogOccurrenceRequest
    {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                metric_id: fidl::new_empty!(u32, D),
                count: fidl::new_empty!(u64, D),
                event_codes: fidl::new_empty!(fidl::encoding::Vector<u32, 10>, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(0) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(u32, D, &mut self.metric_id, decoder, offset + 0, _depth)?;
            fidl::decode!(u64, D, &mut self.count, decoder, offset + 8, _depth)?;
            fidl::decode!(fidl::encoding::Vector<u32, 10>, D, &mut self.event_codes, decoder, offset + 16, _depth)?;
            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEventLoggerLogStringRequest {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEventLoggerLogStringRequest {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            40
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect>
        fidl::encoding::Encode<MetricEventLoggerLogStringRequest, D>
        for &MetricEventLoggerLogStringRequest
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogStringRequest>(offset);
            // Delegate to tuple encoding.
            fidl::encoding::Encode::<MetricEventLoggerLogStringRequest, D>::encode(
                (
                    <u32 as fidl::encoding::ValueTypeMarker>::borrow(&self.metric_id),
                    <fidl::encoding::BoundedString<256> as fidl::encoding::ValueTypeMarker>::borrow(
                        &self.string_value,
                    ),
                    <fidl::encoding::Vector<u32, 10> as fidl::encoding::ValueTypeMarker>::borrow(
                        &self.event_codes,
                    ),
                ),
                encoder,
                offset,
                _depth,
            )
        }
    }
    unsafe impl<
            D: fidl::encoding::ResourceDialect,
            T0: fidl::encoding::Encode<u32, D>,
            T1: fidl::encoding::Encode<fidl::encoding::BoundedString<256>, D>,
            T2: fidl::encoding::Encode<fidl::encoding::Vector<u32, 10>, D>,
        > fidl::encoding::Encode<MetricEventLoggerLogStringRequest, D> for (T0, T1, T2)
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventLoggerLogStringRequest>(offset);
            // Zero out padding regions. There's no need to apply masks
            // because the unmasked parts will be overwritten by fields.
            unsafe {
                let ptr = encoder.buf.as_mut_ptr().add(offset).offset(0);
                (ptr as *mut u64).write_unaligned(0);
            }
            // Write the fields.
            self.0.encode(encoder, offset + 0, depth)?;
            self.1.encode(encoder, offset + 8, depth)?;
            self.2.encode(encoder, offset + 24, depth)?;
            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D>
        for MetricEventLoggerLogStringRequest
    {
        #[inline(always)]
        fn new_empty() -> Self {
            Self {
                metric_id: fidl::new_empty!(u32, D),
                string_value: fidl::new_empty!(fidl::encoding::BoundedString<256>, D),
                event_codes: fidl::new_empty!(fidl::encoding::Vector<u32, 10>, D),
            }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            // Verify that padding bytes are zero.
            let ptr = unsafe { decoder.buf.as_ptr().add(offset).offset(0) };
            let padval = unsafe { (ptr as *const u64).read_unaligned() };
            let mask = 0xffffffff00000000u64;
            let maskedval = padval & mask;
            if maskedval != 0 {
                return Err(fidl::Error::NonZeroPadding {
                    padding_start: offset + 0 + ((mask as u64).trailing_zeros() / 8) as usize,
                });
            }
            fidl::decode!(u32, D, &mut self.metric_id, decoder, offset + 0, _depth)?;
            fidl::decode!(
                fidl::encoding::BoundedString<256>,
                D,
                &mut self.string_value,
                decoder,
                offset + 8,
                _depth
            )?;
            fidl::decode!(fidl::encoding::Vector<u32, 10>, D, &mut self.event_codes, decoder, offset + 24, _depth)?;
            Ok(())
        }
    }

    impl ProjectSpec {
        #[inline(always)]
        fn max_ordinal_present(&self) -> u64 {
            if let Some(_) = self.project_id {
                return 2;
            }
            if let Some(_) = self.customer_id {
                return 1;
            }
            0
        }
    }

    impl fidl::encoding::ValueTypeMarker for ProjectSpec {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for ProjectSpec {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            16
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<ProjectSpec, D>
        for &ProjectSpec
    {
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            mut depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<ProjectSpec>(offset);
            // Vector header
            let max_ordinal: u64 = self.max_ordinal_present();
            encoder.write_num(max_ordinal, offset);
            encoder.write_num(fidl::encoding::ALLOC_PRESENT_U64, offset + 8);
            // Calling encoder.out_of_line_offset(0) is not allowed.
            if max_ordinal == 0 {
                return Ok(());
            }
            depth.increment()?;
            let envelope_size = 8;
            let bytes_len = max_ordinal as usize * envelope_size;
            #[allow(unused_variables)]
            let offset = encoder.out_of_line_offset(bytes_len);
            let mut _prev_end_offset: usize = 0;
            if 1 > max_ordinal {
                return Ok(());
            }

            // Write at offset+(ordinal-1)*envelope_size, since ordinals are one-based and envelopes
            // are envelope_size bytes.
            let cur_offset: usize = (1 - 1) * envelope_size;

            // Zero reserved fields.
            encoder.padding(offset + _prev_end_offset, cur_offset - _prev_end_offset);

            // Safety:
            // - bytes_len is calculated to fit envelope_size*max(member.ordinal).
            // - Since cur_offset is envelope_size*(member.ordinal - 1) and the envelope takes
            //   envelope_size bytes, there is always sufficient room.
            fidl::encoding::encode_in_envelope_optional::<u32, D>(
                self.customer_id.as_ref().map(<u32 as fidl::encoding::ValueTypeMarker>::borrow),
                encoder,
                offset + cur_offset,
                depth,
            )?;

            _prev_end_offset = cur_offset + envelope_size;
            if 2 > max_ordinal {
                return Ok(());
            }

            // Write at offset+(ordinal-1)*envelope_size, since ordinals are one-based and envelopes
            // are envelope_size bytes.
            let cur_offset: usize = (2 - 1) * envelope_size;

            // Zero reserved fields.
            encoder.padding(offset + _prev_end_offset, cur_offset - _prev_end_offset);

            // Safety:
            // - bytes_len is calculated to fit envelope_size*max(member.ordinal).
            // - Since cur_offset is envelope_size*(member.ordinal - 1) and the envelope takes
            //   envelope_size bytes, there is always sufficient room.
            fidl::encoding::encode_in_envelope_optional::<u32, D>(
                self.project_id.as_ref().map(<u32 as fidl::encoding::ValueTypeMarker>::borrow),
                encoder,
                offset + cur_offset,
                depth,
            )?;

            _prev_end_offset = cur_offset + envelope_size;

            Ok(())
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for ProjectSpec {
        #[inline(always)]
        fn new_empty() -> Self {
            Self::default()
        }

        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            mut depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            let len = match fidl::encoding::decode_vector_header(decoder, offset)? {
                None => return Err(fidl::Error::NotNullable),
                Some(len) => len,
            };
            // Calling decoder.out_of_line_offset(0) is not allowed.
            if len == 0 {
                return Ok(());
            };
            depth.increment()?;
            let envelope_size = 8;
            let bytes_len = len * envelope_size;
            let offset = decoder.out_of_line_offset(bytes_len)?;
            // Decode the envelope for each type.
            let mut _next_ordinal_to_read = 0;
            let mut next_offset = offset;
            let end_offset = offset + bytes_len;
            _next_ordinal_to_read += 1;
            if next_offset >= end_offset {
                return Ok(());
            }

            // Decode unknown envelopes for gaps in ordinals.
            while _next_ordinal_to_read < 1 {
                fidl::encoding::decode_unknown_envelope(decoder, next_offset, depth)?;
                _next_ordinal_to_read += 1;
                next_offset += envelope_size;
            }

            let next_out_of_line = decoder.next_out_of_line();
            let handles_before = decoder.remaining_handles();
            if let Some((inlined, num_bytes, num_handles)) =
                fidl::encoding::decode_envelope_header(decoder, next_offset)?
            {
                let member_inline_size =
                    <u32 as fidl::encoding::TypeMarker>::inline_size(decoder.context);
                if inlined != (member_inline_size <= 4) {
                    return Err(fidl::Error::InvalidInlineBitInEnvelope);
                }
                let inner_offset;
                let mut inner_depth = depth.clone();
                if inlined {
                    decoder.check_inline_envelope_padding(next_offset, member_inline_size)?;
                    inner_offset = next_offset;
                } else {
                    inner_offset = decoder.out_of_line_offset(member_inline_size)?;
                    inner_depth.increment()?;
                }
                let val_ref = self.customer_id.get_or_insert_with(|| fidl::new_empty!(u32, D));
                fidl::decode!(u32, D, val_ref, decoder, inner_offset, inner_depth)?;
                if !inlined && decoder.next_out_of_line() != next_out_of_line + (num_bytes as usize)
                {
                    return Err(fidl::Error::InvalidNumBytesInEnvelope);
                }
                if handles_before != decoder.remaining_handles() + (num_handles as usize) {
                    return Err(fidl::Error::InvalidNumHandlesInEnvelope);
                }
            }

            next_offset += envelope_size;
            _next_ordinal_to_read += 1;
            if next_offset >= end_offset {
                return Ok(());
            }

            // Decode unknown envelopes for gaps in ordinals.
            while _next_ordinal_to_read < 2 {
                fidl::encoding::decode_unknown_envelope(decoder, next_offset, depth)?;
                _next_ordinal_to_read += 1;
                next_offset += envelope_size;
            }

            let next_out_of_line = decoder.next_out_of_line();
            let handles_before = decoder.remaining_handles();
            if let Some((inlined, num_bytes, num_handles)) =
                fidl::encoding::decode_envelope_header(decoder, next_offset)?
            {
                let member_inline_size =
                    <u32 as fidl::encoding::TypeMarker>::inline_size(decoder.context);
                if inlined != (member_inline_size <= 4) {
                    return Err(fidl::Error::InvalidInlineBitInEnvelope);
                }
                let inner_offset;
                let mut inner_depth = depth.clone();
                if inlined {
                    decoder.check_inline_envelope_padding(next_offset, member_inline_size)?;
                    inner_offset = next_offset;
                } else {
                    inner_offset = decoder.out_of_line_offset(member_inline_size)?;
                    inner_depth.increment()?;
                }
                let val_ref = self.project_id.get_or_insert_with(|| fidl::new_empty!(u32, D));
                fidl::decode!(u32, D, val_ref, decoder, inner_offset, inner_depth)?;
                if !inlined && decoder.next_out_of_line() != next_out_of_line + (num_bytes as usize)
                {
                    return Err(fidl::Error::InvalidNumBytesInEnvelope);
                }
                if handles_before != decoder.remaining_handles() + (num_handles as usize) {
                    return Err(fidl::Error::InvalidNumHandlesInEnvelope);
                }
            }

            next_offset += envelope_size;

            // Decode the remaining unknown envelopes.
            while next_offset < end_offset {
                _next_ordinal_to_read += 1;
                fidl::encoding::decode_unknown_envelope(decoder, next_offset, depth)?;
                next_offset += envelope_size;
            }

            Ok(())
        }
    }

    impl fidl::encoding::ValueTypeMarker for MetricEventPayload {
        type Borrowed<'a> = &'a Self;
        fn borrow(value: &<Self as fidl::encoding::TypeMarker>::Owned) -> Self::Borrowed<'_> {
            value
        }
    }

    unsafe impl fidl::encoding::TypeMarker for MetricEventPayload {
        type Owned = Self;

        #[inline(always)]
        fn inline_align(_context: fidl::encoding::Context) -> usize {
            8
        }

        #[inline(always)]
        fn inline_size(_context: fidl::encoding::Context) -> usize {
            16
        }
    }

    unsafe impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Encode<MetricEventPayload, D>
        for &MetricEventPayload
    {
        #[inline]
        unsafe fn encode(
            self,
            encoder: &mut fidl::encoding::Encoder<'_, D>,
            offset: usize,
            _depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            encoder.debug_check_bounds::<MetricEventPayload>(offset);
            encoder.write_num::<u64>(self.ordinal(), offset);
            match self {
            MetricEventPayload::Count(ref val) => {
                fidl::encoding::encode_in_envelope::<u64, D>(
                    <u64 as fidl::encoding::ValueTypeMarker>::borrow(val),
                    encoder, offset + 8, _depth
                )
            }
            MetricEventPayload::IntegerValue(ref val) => {
                fidl::encoding::encode_in_envelope::<i64, D>(
                    <i64 as fidl::encoding::ValueTypeMarker>::borrow(val),
                    encoder, offset + 8, _depth
                )
            }
            MetricEventPayload::Histogram(ref val) => {
                fidl::encoding::encode_in_envelope::<fidl::encoding::Vector<HistogramBucket, 500>, D>(
                    <fidl::encoding::Vector<HistogramBucket, 500> as fidl::encoding::ValueTypeMarker>::borrow(val),
                    encoder, offset + 8, _depth
                )
            }
            MetricEventPayload::StringValue(ref val) => {
                fidl::encoding::encode_in_envelope::<fidl::encoding::BoundedString<256>, D>(
                    <fidl::encoding::BoundedString<256> as fidl::encoding::ValueTypeMarker>::borrow(val),
                    encoder, offset + 8, _depth
                )
            }
            MetricEventPayload::__SourceBreaking { .. } => Err(fidl::Error::UnknownUnionTag),
        }
        }
    }

    impl<D: fidl::encoding::ResourceDialect> fidl::encoding::Decode<Self, D> for MetricEventPayload {
        #[inline(always)]
        fn new_empty() -> Self {
            Self::__SourceBreaking { unknown_ordinal: 0 }
        }

        #[inline]
        unsafe fn decode(
            &mut self,
            decoder: &mut fidl::encoding::Decoder<'_, D>,
            offset: usize,
            mut depth: fidl::encoding::Depth,
        ) -> fidl::Result<()> {
            decoder.debug_check_bounds::<Self>(offset);
            #[allow(unused_variables)]
            let next_out_of_line = decoder.next_out_of_line();
            let handles_before = decoder.remaining_handles();
            let (ordinal, inlined, num_bytes, num_handles) =
                fidl::encoding::decode_union_inline_portion(decoder, offset)?;

            let member_inline_size = match ordinal {
            1 => <u64 as fidl::encoding::TypeMarker>::inline_size(decoder.context),
            2 => <i64 as fidl::encoding::TypeMarker>::inline_size(decoder.context),
            3 => <fidl::encoding::Vector<HistogramBucket, 500> as fidl::encoding::TypeMarker>::inline_size(decoder.context),
            4 => <fidl::encoding::BoundedString<256> as fidl::encoding::TypeMarker>::inline_size(decoder.context),
            0 => return Err(fidl::Error::UnknownUnionTag),
            _ => num_bytes as usize,
        };

            if inlined != (member_inline_size <= 4) {
                return Err(fidl::Error::InvalidInlineBitInEnvelope);
            }
            let _inner_offset;
            if inlined {
                decoder.check_inline_envelope_padding(offset + 8, member_inline_size)?;
                _inner_offset = offset + 8;
            } else {
                depth.increment()?;
                _inner_offset = decoder.out_of_line_offset(member_inline_size)?;
            }
            match ordinal {
                1 => {
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::Count(_) = self {
                        // Do nothing, read the value into the object
                    } else {
                        // Initialize `self` to the right variant
                        *self = MetricEventPayload::Count(fidl::new_empty!(u64, D));
                    }
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::Count(ref mut val) = self {
                        fidl::decode!(u64, D, val, decoder, _inner_offset, depth)?;
                    } else {
                        unreachable!()
                    }
                }
                2 => {
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::IntegerValue(_) = self {
                        // Do nothing, read the value into the object
                    } else {
                        // Initialize `self` to the right variant
                        *self = MetricEventPayload::IntegerValue(fidl::new_empty!(i64, D));
                    }
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::IntegerValue(ref mut val) = self {
                        fidl::decode!(i64, D, val, decoder, _inner_offset, depth)?;
                    } else {
                        unreachable!()
                    }
                }
                3 => {
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::Histogram(_) = self {
                        // Do nothing, read the value into the object
                    } else {
                        // Initialize `self` to the right variant
                        *self = MetricEventPayload::Histogram(
                            fidl::new_empty!(fidl::encoding::Vector<HistogramBucket, 500>, D),
                        );
                    }
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::Histogram(ref mut val) = self {
                        fidl::decode!(fidl::encoding::Vector<HistogramBucket, 500>, D, val, decoder, _inner_offset, depth)?;
                    } else {
                        unreachable!()
                    }
                }
                4 => {
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::StringValue(_) = self {
                        // Do nothing, read the value into the object
                    } else {
                        // Initialize `self` to the right variant
                        *self = MetricEventPayload::StringValue(fidl::new_empty!(
                            fidl::encoding::BoundedString<256>,
                            D
                        ));
                    }
                    #[allow(irrefutable_let_patterns)]
                    if let MetricEventPayload::StringValue(ref mut val) = self {
                        fidl::decode!(
                            fidl::encoding::BoundedString<256>,
                            D,
                            val,
                            decoder,
                            _inner_offset,
                            depth
                        )?;
                    } else {
                        unreachable!()
                    }
                }
                #[allow(deprecated)]
                ordinal => {
                    for _ in 0..num_handles {
                        decoder.drop_next_handle()?;
                    }
                    *self = MetricEventPayload::__SourceBreaking { unknown_ordinal: ordinal };
                }
            }
            if !inlined && decoder.next_out_of_line() != next_out_of_line + (num_bytes as usize) {
                return Err(fidl::Error::InvalidNumBytesInEnvelope);
            }
            if handles_before != decoder.remaining_handles() + (num_handles as usize) {
                return Err(fidl::Error::InvalidNumHandlesInEnvelope);
            }
            Ok(())
        }
    }
}