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Merged
jmacd merged 9 commits into from
Feb 23, 2026
Merged

Add support for MMSC instruments by introducing Histogram bridge #2050

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b5e80bf
Add MMSC instrument
utpilla Feb 17, 2026
dfc8e39
Fix clippy warnings
utpilla Feb 17, 2026
5f3a862
Address PR comments
utpilla Feb 17, 2026
1132e54
Address PR comments
utpilla Feb 18, 2026
81c906a
Merge remote-tracking branch 'origin/main' into utpilla/Add-MMSC-inst…
utpilla Feb 18, 2026
da0cf4d
Skip output when count == 0
utpilla Feb 18, 2026
7b9298d
Merge branch 'main' into utpilla/Add-MMSC-instrument
utpilla Feb 19, 2026
b1d5c46
Merge branch 'main' into utpilla/Add-MMSC-instrument
cijothomas Feb 19, 2026
5b665c1
Merge branch 'main' into utpilla/Add-MMSC-instrument
cijothomas Feb 20, 2026
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509 changes: 394 additions & 115 deletions rust/otap-dataflow/crates/admin/src/telemetry.rs
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148 changes: 82 additions & 66 deletions rust/otap-dataflow/crates/telemetry-macros/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -130,96 +130,112 @@ pub fn derive_metric_set_handler(input: TokenStream) -> TokenStream {
let seg_opt = tp.path.segments.last();
if let Some(seg) = seg_opt {
let ident_ty = seg.ident.to_string();
// Expect generic arguments <u64> or <f64>
let value_type_variant = match &seg.arguments {
syn::PathArguments::AngleBracketed(ab) => {
if ab.args.len() != 1 {
return syn::Error::new(

// Handle Mmsc separately — it has no generic type parameter.
if ident_ty == "Mmsc" {
(
quote!(otap_df_telemetry::descriptor::Instrument::Mmsc),
quote!(Some(otap_df_telemetry::descriptor::Temporality::Delta)),
quote!(otap_df_telemetry::descriptor::MetricValueType::F64),
ident_ty,
)
} else {
// Expect generic arguments <u64> or <f64>
let value_type_variant = match &seg.arguments {
syn::PathArguments::AngleBracketed(ab) => {
if ab.args.len() != 1 {
return syn::Error::new(
seg.ident.span(),
"Metric field type must be one of Counter<u64|f64>, ObserveCounter<u64|f64>, UpDownCounter<u64|f64>, ObserveUpDownCounter<u64|f64>, Gauge<u64|f64>",
)
.to_compile_error()
.into();
}
match ab.args.first() {
Some(syn::GenericArgument::Type(syn::Type::Path(p)))
if p.path.is_ident("u64") =>
{
quote!(
}
match ab.args.first() {
Some(syn::GenericArgument::Type(syn::Type::Path(
p,
))) if p.path.is_ident("u64") => {
quote!(
otap_df_telemetry::descriptor::MetricValueType::U64
)
}
Some(syn::GenericArgument::Type(syn::Type::Path(p)))
if p.path.is_ident("f64") =>
{
quote!(
}
Some(syn::GenericArgument::Type(syn::Type::Path(
p,
))) if p.path.is_ident("f64") => {
quote!(
otap_df_telemetry::descriptor::MetricValueType::F64
)
}
_ => {
return syn::Error::new(
}
_ => {
return syn::Error::new(
seg.ident.span(),
"Metric field type must be one of Counter<u64|f64>, ObserveCounter<u64|f64>, UpDownCounter<u64|f64>, ObserveUpDownCounter<u64|f64>, Gauge<u64|f64>",
)
.to_compile_error()
.into();
}
}
}
}
_ => {
return syn::Error::new(
_ => {
return syn::Error::new(
seg.ident.span(),
"Metric field type must be one of Counter<u64|f64>, ObserveCounter<u64|f64>, UpDownCounter<u64|f64>, ObserveUpDownCounter<u64|f64>, Gauge<u64|f64>",
)
.to_compile_error()
.into();
}
};
let (instrument_variant, temporality_variant) = match ident_ty.as_str()
{
"Counter" => (
quote!(otap_df_telemetry::descriptor::Instrument::Counter),
quote!(Some(otap_df_telemetry::descriptor::Temporality::Delta)),
),
"ObserveCounter" => (
quote!(otap_df_telemetry::descriptor::Instrument::Counter),
quote!(Some(
otap_df_telemetry::descriptor::Temporality::Cumulative
)),
),
"UpDownCounter" => (
quote!(
}
};
let (instrument_variant, temporality_variant) = match ident_ty
.as_str()
{
"Counter" => (
quote!(otap_df_telemetry::descriptor::Instrument::Counter),
quote!(Some(
otap_df_telemetry::descriptor::Temporality::Delta
)),
),
"ObserveCounter" => (
quote!(otap_df_telemetry::descriptor::Instrument::Counter),
quote!(Some(
otap_df_telemetry::descriptor::Temporality::Cumulative
)),
),
"UpDownCounter" => (
quote!(
otap_df_telemetry::descriptor::Instrument::UpDownCounter
),
quote!(Some(otap_df_telemetry::descriptor::Temporality::Delta)),
),
"ObserveUpDownCounter" => (
quote!(
quote!(Some(
otap_df_telemetry::descriptor::Temporality::Delta
)),
),
"ObserveUpDownCounter" => (
quote!(
otap_df_telemetry::descriptor::Instrument::UpDownCounter
),
quote!(Some(
otap_df_telemetry::descriptor::Temporality::Cumulative
)),
),
"Gauge" => (
quote!(otap_df_telemetry::descriptor::Instrument::Gauge),
quote!(None),
),
other => {
return syn::Error::new(
seg.ident.span(),
format!("Unsupported metric instrument type: {other}"),
)
.to_compile_error()
.into();
}
};
(
instrument_variant,
temporality_variant,
value_type_variant,
ident_ty,
)
quote!(Some(
otap_df_telemetry::descriptor::Temporality::Cumulative
)),
),
"Gauge" => (
quote!(otap_df_telemetry::descriptor::Instrument::Gauge),
quote!(None),
),
other => {
return syn::Error::new(
seg.ident.span(),
format!("Unsupported metric instrument type: {other}"),
)
.to_compile_error()
.into();
}
};
(
instrument_variant,
temporality_variant,
value_type_variant,
ident_ty,
)
} // end of else (non-Mmsc types)
} else {
return syn::Error::new(
field.ty.span(),
Expand All @@ -246,7 +262,7 @@ pub fn derive_metric_set_handler(input: TokenStream) -> TokenStream {
metric_field_value_types.push(value_type_variant);

match instrument_ty_name.as_str() {
"Counter" | "UpDownCounter" => {
"Counter" | "UpDownCounter" | "Mmsc" => {
metric_field_clear_stmts.push(quote!( self.#field_ident.reset(); ));
metric_field_needs_flush_checks.push(quote!(
if !otap_df_telemetry::metrics::MetricValue::from(self.#field_ident.get()).is_zero() {
Expand Down
1 change: 1 addition & 0 deletions rust/otap-dataflow/crates/telemetry/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -49,3 +49,4 @@ tracing-subscriber = { workspace = true, features = ["env-filter","registry", "s
[dev-dependencies]
tower = { workspace = true }
tempfile = { workspace = true }
opentelemetry_sdk = { workspace = true, features = ["testing"] }
16 changes: 8 additions & 8 deletions rust/otap-dataflow/crates/telemetry/src/collector.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,7 @@ mod tests {
impl MockMetricSet {
fn new() -> Self {
Self {
values: vec![MetricValue::U64(0), MetricValue::U64(0)],
values: vec![MetricValue::from(0u64), MetricValue::from(0u64)],
}
}
}
Expand Down Expand Up @@ -249,14 +249,14 @@ mod tests {
reporter
.report_snapshot(create_test_snapshot(
key,
vec![MetricValue::U64(10), MetricValue::U64(20)],
vec![MetricValue::from(10u64), MetricValue::from(20u64)],
))
.await
.unwrap();
reporter
.report_snapshot(create_test_snapshot(
key,
vec![MetricValue::U64(5), MetricValue::U64(15)],
vec![MetricValue::from(5u64), MetricValue::from(15u64)],
))
.await
.unwrap();
Expand All @@ -275,9 +275,9 @@ mod tests {
assert_eq!(collected.len(), 2);
// Order follows descriptor order
assert_eq!(collected[0].0, "counter1");
assert_eq!(collected[0].1, MetricValue::U64(15));
assert_eq!(collected[0].1, MetricValue::from(15u64));
assert_eq!(collected[1].0, "counter2");
assert_eq!(collected[1].1, MetricValue::U64(35));
assert_eq!(collected[1].1, MetricValue::from(35u64));

// Close the channel and ensure loop ends returning None
drop(reporter);
Expand All @@ -298,7 +298,7 @@ mod tests {
reporter
.report_snapshot(create_test_snapshot(
key,
vec![MetricValue::U64(7), MetricValue::U64(0)],
vec![MetricValue::from(7u64), MetricValue::from(0u64)],
))
.await
.unwrap();
Expand All @@ -314,8 +314,8 @@ mod tests {
assert_eq!(
first,
vec![
("counter1", MetricValue::U64(7)),
("counter2", MetricValue::U64(0))
("counter1", MetricValue::from(7u64)),
("counter2", MetricValue::from(0u64))
]
);

Expand Down
5 changes: 5 additions & 0 deletions rust/otap-dataflow/crates/telemetry/src/descriptor.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,11 @@ pub enum Instrument {
Gauge,
/// Distribution of recorded values, used for latencies or request sizes
Histogram,
/// Pre-aggregated min/max/sum/count summary.
///
/// Internally tracked as an `Mmsc` instrument; the dispatcher exports the
/// aggregated snapshot as a synthetic OTel histogram without bucket counts.
Mmsc,
}

/// Aggregation temporality for sum-like instruments.
Expand Down
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