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So far, if a target exposes a histogram with both classic and native buckets, a native-histogram enabled Prometheus would ignore the classic buckets. With the new scrape config option `scrape_classic_histograms` set, both buckets will be ingested, creating all the series of a classic histogram in parallel to the native histogram series. For example, a histogram `foo` would create a native histogram series `foo` and classic series called `foo_sum`, `foo_count`, and `foo_bucket`. This feature can be used in a migration strategy from classic to native histograms, where it is desired to have a transition period during which both native and classic histograms are present. Note that two bugs in classic histogram parsing were found and fixed as a byproduct of testing the new feature: 1. Series created from classic _gauge_ histograms didn't get the _sum/_count/_bucket prefix set. 2. Values of classic _float_ histograms weren't parsed properly. Signed-off-by: beorn7 <beorn@grafana.com> |
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|---|---|---|
| .. | ||
| interface.go | ||
| interface_test.go | ||
| openmetricslex.l | ||
| openmetricslex.l.go | ||
| openmetricsparse.go | ||
| openmetricsparse_test.go | ||
| promlex.l | ||
| promlex.l.go | ||
| promparse.go | ||
| promparse_test.go | ||
| promtestdata.nometa.txt | ||
| promtestdata.txt | ||
| protobufparse.go | ||
| protobufparse_test.go | ||
| README.md | ||
Making changes to textparse lexers
In the rare case that you need to update the textparse lexers, edit promlex.l or openmetricslex.l and then run the following command:
golex -o=promlex.l.go promlex.l
Note that you need golex installed:
go get -u modernc.org/golex