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beorn7 5de2df752f Hacky implementation of protobuf parsing ... This "brings back" protobuf parsing, with the only goal to play with the new sparse histograms. The Prom-2.x style parser is highly adapted to the structure of the Prometheus text format (and later OpenMetrics). Some jumping through hoops is required to feed protobuf into it. This is not meant to be a model for the final implementation. It should just enable sparse histogram ingestion at a reasonable efficiency. Following known shortcomings and flaws: - No tests yet. - Summaries and legacy histograms, i.e. without sparse buckets, are ignored. - Staleness doesn't work (but this could be fixed in the appender, to be discussed). - No tricks have been tried that would be similar to the tricks the text parsers do (like direct pointers into the HTTP response body). That makes things weird here. Tricky optimizations only make sense once the final format is specified, which will almost certainly not be the old protobuf format. (Interestingly, I expect this implementation to be in fact much more efficient than the original protobuf ingestion in Prom-1.x.) - This is using a proto3 version of metrics.proto (mostly to be consistent with the other protobuf uses). However, proto3 sees no difference between an unset field. We depend on that to distinguish between an unset timestamp and the timestamp 0 (1970-01-01, 00:00:00 UTC). In this experimental code, we just assume that timestamp is never specified and therefore a timestamp of 0 always is interpreted as "not set". Signed-off-by: beorn7 <beorn@grafana.com>		3 years ago
..
testdata	Use SAN in test certificate (#7789)	4 years ago
helpers_test.go	Append sparse histograms into the Head block (#9013)	3 years ago
manager.go	Switched to go-kit/log	4 years ago
manager_test.go	Testify: move to require (#8122)	4 years ago
scrape.go	Hacky implementation of protobuf parsing	3 years ago
scrape_test.go	Hacky implementation of protobuf parsing	3 years ago
target.go	SD: Add target creation failure counter and change failure handling (#8786)	4 years ago
target_test.go	SD: Add target creation failure counter and change failure handling (#8786)	4 years ago