feat: implement gauge and counter support for OpenMetrics 2.0 - #894

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dashpole wants to merge 16 commits into

prometheus:mainfrom

Commits on Aug 13, 2026

feat: implement gauge and counter support for OpenMetrics 2.0
dashpole
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98c7068
address code review comments
dashpole
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d2760c9
Add NegotiateIncluding and refactor negotiation functions
dashpole
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45f57e0
Address review feedback for OpenMetrics 2.0 exemplars and counter start timestamps
dashpole
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a64d75c
Add strict validation to OpenMetrics 2.0 encoder to reject invalid input
dashpole
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239fa96
Add writeProtoTimestamp helper to avoid float64 precision loss
dashpole
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13d8da9
Use writeProtoTimestamp for created timestamp to avoid float64 precision loss
dashpole
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caf051d
Use writeProtoTimestamp for exemplar timestamp to avoid float64 precision loss
dashpole
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0f5e052
Update subsecond created timestamp test output to full nanosecond precision
dashpole
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1aeabde
Apply suggestions from code review

dashpole
and
bwplotka
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7876752
expfmt: add NegotiateAccept and deprecate older negotiate functions
dashpole
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2452eff
expfmt: unexport fmtOpenMetrics_2_0_0
dashpole
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d5e4d54
expfmt: assert written bytes count in OpenMetrics 2.0 tests
dashpole
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f8cae9a
expfmt: add test for counter invalid created timestamp
dashpole
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2c74001
expfmt: add test for exemplar invalid timestamp
dashpole
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d9f239f
expfmt: assert expected error message in TestCreateOpenMetrics20_Errors
dashpole
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529cf5d