[Copilot]

Extend the composable histogram assertion pattern to long/double sums and gauges, exponential histograms, and summaries, then migrate existing test assertions to the flat helper form.

testing.waitAndAssertMetrics(
    INSTRUMENTATION_NAME,
    longSum(
        metric -> metric.hasName("requests").hasUnit("{request}"),
        point -> point.hasValue(1)));

The migration preserves metric metadata, point expectations, aggregation checks, and existing collection-matching behavior. No production telemetry changes.

Stacked on #20741.

[opentelemetry-pr-dashboard]

Pull request dashboard status

Waiting on the author · refreshed 2026-10-20 18:17 UTC

Move out of draft to request review.

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[Copilot]

🟢 Approval recommended

The additions consistently follow the existing assertion pattern, with focused coverage and no identified blocking issues.

No open issues 🎉

What changed in this PR

Extends the composable histogram assertion pattern from #20741 to six additional metric types in testing-common.

Changes:

• Adds typed helpers for long/double sums and gauges, exponential histograms, and summaries.
• Tests metadata, unordered point matching, extra-point rejection, and incompatible-type rejection.

File	Description
testing-common/​src/​test/​java/​io/​opentelemetry/​instrumentation/​testing/​InstrumentationTestRunnerTest.java	Adds helper coverage and metric fixtures.
testing-common/​src/​main/​java/​io/​opentelemetry/​instrumentation/​testing/​util/​MetricAssertions.java	Adds six composable typed assertion helpers.

_{Review effort: Balanced}