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native-histograms: Fixed PrometheusProto scrape format preference. (#13010) 

Broken by https://github.com/prometheus/prometheus/pull/12738. We have to update both global variables (as GlobalConfig is not a pointer here).
DefaultConfig is used when no global: section is provided, whereas DefaultGlobalConfig is used when it's provided and for individual scrape configs.

Reported on #prometheus-dev (thanks to @beorn7): https://cloud-native.slack.com/archives/C01AUBA4PFE/p1697733267205649

Tested manually, it would be nice to add test at some point (quick fix for now).

Signed-off-by: bwplotka <bwplotka@gmail.com>
This commit is contained in:
Bartlomiej Plotka 2023-10-19 20:38:45 +01:00 committed by GitHub
parent 8a3af74121
commit 6d083312e7
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1 changed files with 3 additions and 2 deletions
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5
cmd/prometheus/main.go
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@ -202,9 +202,10 @@ func (c *flagConfig) setFeatureListOptions(logger log.Logger) error {
level.Info(logger).Log("msg", "No default port will be appended to scrape targets' addresses.")
case "native-histograms":
c.tsdb.EnableNativeHistograms = true
// Change global variable. Hacky, but it's hard to pass new option or default to unmarshaller.
// Change relevant global variables. Hacky, but it's hard to pass a new option or default to unmarshallers.
config.DefaultConfig.GlobalConfig.ScrapeProtocols = config.DefaultNativeHistogramScrapeProtocols
level.Info(logger).Log("msg", "Experimental native histogram support enabled. Changed default scrape_protocols to prefer PrometheusProto format.", "global.scrape_protocols", fmt.Sprintf("%v", config.DefaultConfig.GlobalConfig.ScrapeProtocols))
config.DefaultGlobalConfig.ScrapeProtocols = config.DefaultNativeHistogramScrapeProtocols
level.Info(logger).Log("msg", "Experimental native histogram support enabled. Changed default scrape_protocols to prefer PrometheusProto format.", "global.scrape_protocols", fmt.Sprintf("%v", config.DefaultGlobalConfig.ScrapeProtocols))
case "":
continue
case "promql-at-modifier", "promql-negative-offset":