[chore] [reveiver/prometheusreceiver] Add unit tests around protobuf negotiation #29153
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Description:
The code needs some basic tests that can be later expanded with tests for native histograms use cases.
Changes:
Refactored
testComponent
function to be easier to customize the configuration of the scrape.Expanded
compareHistogram
to assert on the explicit boundaries as well.Added function
prometheusMetricFamilyToProtoBuf
to helpers to be able to turn serialize a Prometheus metric familyinto Protobuf.
Added simple test of Protobuf based scrape of counters, gauges, summaries and histograms.
Link to tracking Issue:
#26555
Followup to #27030
Related to #28663
Testing:
Adding simple e2e test for scraping over Protobuf.
Documentation:
Not applicable.