Add stable Metrics class to decouple consumers from protobuf version#1873
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zeitlinger merged 1 commit intomainprometheus/client_java:mainfrom Feb 13, 2026
Merged
Add stable Metrics class to decouple consumers from protobuf version#1873zeitlinger merged 1 commit intomainprometheus/client_java:mainfrom
zeitlinger merged 1 commit intomainprometheus/client_java:mainfrom
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The generated protobuf Metrics.java lives in a versioned package that changes every protobuf release, requiring import updates in all consumer files. Introduce a stable extending class in the version-free package so consumers import from a single stable location. On protobuf upgrades only the extends clause in the stable class changes, handled automatically by generate-protobuf.sh. Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>
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approved by @dhoard |
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Summary
Metrics.javain the version-free...generatedpackage that extends the versioned generated class, so consumer code no longer needs import updates on protobuf upgrades.generate-protobuf.shto make the generated class extensible (finalremoved, constructorprotected) and read the old package from the stable class'sextendsclause.@SuppressWarnings("NonCanonicalType")for Error Prone compatibility.Test plan
mise run buildpasses (all 54 modules)mise run test -pl prometheus-metrics-exposition-formatspasses (47 tests)mise run lint:super-linterpasses