feat: add MetricMetadata.Builder, deprecate wide constructors - #2202
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zeitlinger merged 7 commits intoJun 10, 2026
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The 4-arg and 5-arg constructors require callers to pre-compute expositionBaseName and originalName, leaking internal naming logic into every caller site. The new builder encapsulates that logic: - name(): base name (unit appended if absent) - unit(): appended to name when not already present - counterSuffix(true): sets expositionBaseName to name + "_total", so the exposition writer knows to preserve the suffix rather than double-append it (relevant for UTF-8 metric names) Existing callers (MetricMetadataSupport, MetricMetadata.escape) keep the deprecated constructors with @SuppressWarnings("deprecation"). Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
zeitlinger
marked this pull request as ready for review
June 8, 2026 09:31
jaydeluca
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Jun 8, 2026
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...etheus-metrics-model/src/main/java/io/prometheus/metrics/model/snapshots/MetricMetadata.java
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| /** Builder for {@link MetricMetadata}. */ | ||
| @StableApi | ||
| public static final class Builder { |
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will this solve the use cases in this repo that we now have the suppressions on? i'm not sure it allows us to actually fully deprecate the constructors as-is.
For example, for MetricWithFixedMetadata i think we'd need:
this.metadata = MetricMetadata.builder()
.name(name)
.expositionBaseName(expositionBaseName)
.originalName(originalName)
.help(builder.help)
.unit(builder.unit)
.build();It might be worth trying to migrate any of the ones where we suppress the deprecation warning, just to see if it's possible
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good idea - done
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Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
jaydeluca
approved these changes
Jun 9, 2026
zeitlinger
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Jun 11, 2026
🤖 I have created a release *beep* *boop* --- ## [1.8.0](v1.7.0...v1.8.0) (2026-06-11) ### Features * Add custom labels to exemplars ([#2191](#2191)) ([fd1f3e8](fd1f3e8)) * add MetricMetadata.Builder, deprecate wide constructors ([#2202](#2202)) ([adeef32](adeef32)) ### Bug Fixes * Avoid unnuecessary exemplar allocations ([#2209](#2209)) ([0b6a91f](0b6a91f)) * **deps:** update spring boot to v4.1.0 ([#2213](#2213)) ([df25c08](df25c08)) ### Documentation * cover typed family descriptors and @stableAPI since v1.6.1 ([#2181](#2181)) ([7ca9f99](7ca9f99)) --- > [!IMPORTANT] > Close and reopen this PR to trigger CI checks. --------- Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Co-authored-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
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Summary
Motivation
The OTel exporter (opentelemetry/opentelemetry-java#8346) needs to express per-strategy counter intent without pre-computing expositionBaseName manually. The builder encapsulates that logic and provides a cleaner public API for any downstream adapter that constructs MetricMetadata directly.
Test plan