Add reusable latency histogram helpers - #416
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Log fixture update
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change adds reusable latency histogram helpers and updates a log-fixture timestamp. No merge-blocking current-head risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@ovos_utils/metrics.py`:
- Around line 120-123: Update the bucket key construction in the metrics method
containing the buckets comprehension to use a round-trip-safe bound
representation such as .17g instead of :g, ensuring distinct close bounds retain
separate dictionary entries. Add a test using bounds like 1.0000001 and
1.0000002 to verify both keys and cumulative counts are preserved.
- Around line 53-59: Update the measurement class’s finish method to synchronize
access to _running, _finished, and _elapsed_ms with a measurement-level lock. In
finish, acquire the lock, return for an already-finished measurement,
pause/update the elapsed state as needed, and set _finished before calling
_histogram.observe_ms so concurrent calls record exactly once.
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In `@ovos_utils/metrics.py`:
- Line 7: Restore Python 3.9 compatibility in ovos_utils.metrics by importing
ParamSpec from a compatible backport when needed and replacing the zip call’s
strict=True usage with equivalent validation that works on Python 3.9, or
consistently raise pyproject.toml’s requires-python minimum to 3.10 if the
project intends to retain these APIs.
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CodeRabbit review on OpenVoiceOS#416. pyproject declares requires-python >=3.9, but this module used typing.ParamSpec and zip(strict=True), both 3.10+. On 3.9 the import fails outright. CI only runs 3.10-3.14, so nothing caught it. Types the decorator on its return value instead of ParamSpec, and drops strict= for an explicit length assert -- the invariant it guarded holds by construction, so this keeps the check without the version floor. Raising requires-python to >=3.10 to match what CI actually tests would also fix this, but that is a packaging decision for the whole package rather than something to change inside a feature PR. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Closing this. It existed to give one consumer, OVOS-workshop#509, a shared home for the histogram primitive rather than a second copy. That consumer is closed: the metric it added is derivable from the handler lifecycle events a stock Workshop already puts on the bus, so it is published by a collector registered on the With that consumer gone the remaining argument for landing the primitive here is weaker than the argument for leaving Worth recording for anyone who picks this up: the helper is a small, dependency-free, thread-safe cumulative histogram with fixed buckets, and the reason it was proposed here at all is that both Core and Workshop wanted it and Workshop cannot import Core without reversing the dependency direction. If a future change puts instrumentation back inside this ecosystem rather than beside it, that constraint is unchanged and this is still the natural place for it. |
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Summary
Add reusable, dependency-free latency histogram primitives to
ovos_utils.metrics:Why
OVOS Core, Workshop, and intent pipeline packages need the same low-level timing and histogram storage without importing one another or creating a dependency cycle. This keeps metric ownership in each instrumented package while giving their process-local metrics providers one shared implementation.
The helper intentionally has no Prometheus server, labels, request identifiers, or runtime policy. Export remains the host runtime's responsibility through the existing metrics-provider entry point.
This is the prerequisite proposed in the architecture discussion on OpenVoiceOS/ovos-workshop#509. Consumer PRs can switch to this API after an
ovos-utilsalpha containing it is published, with explicit minimum-version bumps.Validation
ruff check ovos_utils/metrics.py test/unittests/test_metrics.pyPYTHONPATH=. pytest -q test/unittests/test_metrics.py— 19 passedgit diff --checkSummary by CodeRabbit
New Features
Bug Fixes