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

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dashpole wants to merge 9 commits into

prometheus:mainfrom

Commits on Jul 31, 2026

feat: implement gauge and counter support for OpenMetrics 2.0
dashpole
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address code review comments
dashpole
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Add NegotiateIncluding and refactor negotiation functions
dashpole
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Address review feedback for OpenMetrics 2.0 exemplars and counter start timestamps
dashpole
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Add strict validation to OpenMetrics 2.0 encoder to reject invalid input
dashpole
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Add writeProtoTimestamp helper to avoid float64 precision loss
dashpole
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Use writeProtoTimestamp for created timestamp to avoid float64 precision loss
dashpole
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Use writeProtoTimestamp for exemplar timestamp to avoid float64 precision loss
dashpole
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Update subsecond created timestamp test output to full nanosecond precision
dashpole
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