feat(parsers.openmetrics): Add parser for OpenMetrics format #15298
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Summary
This PR adds an OpenMetrics parser and integrates it into the prometheus input plugin. To allow more control over the processing of incoming messages, the PR also adds a
content_type_override
option to define the kind of messages expected for cases where the endpoint does not send a content-type or sends a wrong one (e.g. prometheus-text instead of openmetrics-text).Checklist
Related issues
resolves #9547