fix(deps): update opentelemetry-rust monorepo to 0.32.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
opentelemetry (source)	dependencies	minor	0.31.0 → 0.32.0
opentelemetry-stdout (source)	dependencies	minor	0.31.0 → 0.32.0
opentelemetry_sdk (source)	dependencies	minor	0.31.0 → 0.32.0

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Release Notes

open-telemetry/opentelemetry-rust (opentelemetry)

v0.32.0

Compare Source

Released 2026-May-08

• Added BoundCounter<T> and BoundHistogram<T> types that cache resolved
  aggregator references for a fixed attribute set. Created via Counter::bind()
  and Histogram::bind(), bound instruments bypass per-call attribute lookup,
  providing significant performance improvements for hot paths where the same
  attributes are used repeatedly. Both types implement Clone so a single bound
  state can be shared across threads or modules without re-binding. Also adds
  the SyncInstrument::bind() trait method and BoundSyncInstrument<T> trait
  for SDK implementors; the trait method has a no-op default so custom
  SyncInstrument impls degrade gracefully without panicking. Gated behind the
  experimental_metrics_bound_instruments feature flag.
• Add reserve method to opentelemetry::propagation::Injector to hint at the number of elements that will be added to avoid multiple resize operations of the underlying data structure. Has an empty default implementation.
• Breaking Removed the following public fields and methods from the SpanBuilder #​3227:
  • trace_id, span_id, end_time, status, sampling_result
  • with_trace_id, with_span_id, with_end_time, with_status, with_sampling_result
• Added #[must_use] attribute to opentelemetry::metrics::AsyncInstrumentBuilder to add compile time warning when .build() is not called on observable instrument builders, preventing silent failures where callbacks are never registered and metrics are never reported.
• Breaking Moved the following SDK sampling types from opentelemetry::trace to opentelemetry_sdk::trace #​3277:
  • SamplingDecision, SamplingResult
  • These types are SDK implementation details and should be imported from opentelemetry_sdk::trace instead.
• "spec_unstable_logs_enabled" feature flag is removed. The capability (and the
  backing specification) is now stable and is enabled by default.
  3278
• Remove the empty "message" field from tracing events emitted via the internal-logs feature
• Fix panic when calling Context::current() from Drop implementations triggered by ContextGuard cleanup (#​3262).

open-telemetry/opentelemetry-rust (opentelemetry-stdout)

v0.32.0

Compare Source

Released 2026-May-08

• ExponentialHistogram supported in stdout

open-telemetry/opentelemetry-rust (opentelemetry_sdk)

v0.32.0

Compare Source

Released 2026-May-08

• SimpleSpanProcessor now suppresses telemetry during export, preventing
  telemetry-induced-telemetry feedback loops. This aligns with the existing
  behavior in BatchSpanProcessor and SimpleLogProcessor.
• Removed SimpleConcurrentLogProcessor and the experimental_logs_concurrent_log_processor
  feature flag. The use cases it was designed for (ETW/user_events exporters) are
  better served by modeling those exporters as processors directly.
• Added Counter::bind() and Histogram::bind() SDK implementations that
  return pre-bound measurement handles (BoundCounter<T>, BoundHistogram<T>).
  Bound instruments resolve the attribute-to-aggregator mapping once at bind time
  and cache the result, eliminating per-call HashMap lookups. View attribute
  filtering is applied at bind time so the hot path stays free of per-call
  attribute processing. Bound and unbound recordings with the same (post-view)
  attribute set always aggregate into the same data point, including the empty
  attribute set. Bound entries are never evicted during delta collection while
  a handle exists — idle cycles produce no export but the tracker persists. If
  bind() is called at the cardinality limit, the handle binds directly to
  the overflow tracker — its writes stay on the same direct (no-lookup) hot
  path and consistently land in the otel.metric.overflow=true bucket for
  the lifetime of the handle. To recover a bound handle after delta collection
  frees space, drop the existing handle and call bind() again. Gated behind
  the experimental_metrics_bound_instruments feature flag. Benchmarks show
  ~28x speedup for counter operations and ~9x for histograms.
• Delta metrics collection now uses in-place eviction instead of draining the
  HashMap on every collect cycle. Stale attribute sets that received no measurements
  since the last collection are evicted. Note: recovery from cardinality overflow
  now requires 2 collect cycles — the first marks entries as stale, the second
  evicts them.
• Breaking The SDK testing feature is now runtime agnostic. #​3407
  • TokioSpanExporter and new_tokio_test_exporter have been renamed to TestSpanExporter and new_test_exporter.
  • The following transitive dependencies and features have been removed: tokio/rt, tokio/time, tokio/macros, tokio/rt-multi-thread, tokio-stream, experimental_async_runtime
• Store InstrumentationScope in Arc internally in SdkTracer, making tracer clones cheaper (Arc refcount increment instead of deep copy).
• Add 32-bit platform support by using portable-atomic for AtomicI64 and AtomicU64 in the metrics module. This enables compilation on 32-bit ARM targets (e.g., armv5te-unknown-linux-gnueabi, armv7-unknown-linux-gnueabihf).
• Aggregation enum and StreamBuilder::with_aggregation() are now stable and no longer require the spec_unstable_metrics_views feature flag.
• Fix service.name Resource attribute fallback to follow OpenTelemetry
  specification by using unknown_service:<process.executable.name> format when
  service name is not explicitly configured. Previously, it only used
  unknown_service.
• Fix SpanExporter::shutdown() default timeout from 5 nanoseconds to 5 seconds.
• Breaking SpanExporter trait methods shutdown, shutdown_with_timeout, and force_flush now take &self instead of &mut self for consistency with LogExporter and PushMetricExporter. Implementers using interior mutability (e.g., Mutex, AtomicBool) require no changes.
• Added Resource::get_ref(&self, key: &Key) -> Option<&Value> to allow retrieving a reference to a resource value without cloning.
• Breaking Removed the following public hidden methods from the SdkTracer #​3227:
  • id_generator, should_sample
• Breaking Moved the following SDK sampling types from opentelemetry::trace to opentelemetry_sdk::trace #​3277:
  • SamplingDecision, SamplingResult
  • These types are SDK implementation details and should be imported from opentelemetry_sdk::trace instead.
• StreamBuilder::build() now rejects usize::MAX as a cardinality limit
  with a validation error. #​3506
• Fix Histogram boundaries being ignored in the presence of views #​3312
• TracerProviderBuilder::with_sampler allows to pass boxed instance of ShouldSample [#​3313][3313]
• Fix ObservableCounter and ObservableUpDownCounter now correctly report only data points from the current measurement cycle, removing stale attribute combinations that are no longer observed. #​3248
• Fix panic when SpanProcessor::on_end calls Context::current() (#​3262).
  • Updated SpanProcessor::on_end documentation to clarify that Context::current() returns the parent context, not the span's context
• Fix traceparent headers with unknown flags (e.g. W3C random-trace-id flag 0x02) being incorrectly rejected. Unknown flags are now accepted and zeroed out as required by the W3C trace-context spec. #​3435
• Breaking InMemoryExporterError has been removed and replaced by OTelSdkError, and a new JaegerRemoteSamplerBuildError introduced to replace last uses of TraceError. #​3458
• "spec_unstable_logs_enabled" feature flag is removed. The capability (and the
  backing specification) is now stable and is enabled by default. #​3278

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