VictoriaMetrics/lib/promscrape/discoveryutils
Aliaksandr Valialkin 1b70238dca
lib/promscrape/discovery/kuma: follow-up for 317fef95f9
- Do not generate __meta_server label, since it is unavailable in Prometheus.
- Add a link to https://docs.victoriametrics.com/sd_configs.html#kuma_sd_configs to docs/CHANGELOG.md,
  so users could click it and read the docs without the need to search the corresponding docs.
- Remove kumaTarget struct, since it is easier generating labels for discovered targets
  directly from the response returned by Kuma. This simplifies the code.
- Store the generated labels for discovered targets inside atomic.Value. This allows reading them
  from concurrent goroutines without the need to use mutex.
- Use synchronouse requests to Kuma instead of long polling, since there is a little sense
  in the long polling when the Kuma server may return 304 Not Modified response every -promscrape.kumaSDCheckInterval.
- Remove -promscrape.kuma.waitTime command-line flag, since it is no longer needed when long polling isn't used.
- Set default value for -promscrape.kumaSDCheckInterval to 30s in order to be consistent with Prometheus.
- Remove unnecessary indirections for string literals, which are used only once, in order to improve code readability.
- Remove unused fields from discoveryRequest and discoveryResponse.
- Update tests.
- Document why fetch_timeout and refresh_interval options are missing in kuma_sd_config.
- Add docs to discoveryutils.RequestCallback and discoveryutils.ResponseCallback,
  since these are public types.

Side notes: it is weird that Prometheus implementation for kuma_sd_configs sets `instance` label,
since usually this label is set by the Prometheus itself to __address__ after the relabeling phase.
See https://www.robustperception.io/life-of-a-label/

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/3389

See https://github.com/prometheus/prometheus/issues/7919
and https://github.com/prometheus/prometheus/pull/8844
as a reference implementation in Prometheus
2023-02-22 17:50:54 -08:00
..
client.go lib/promscrape/discovery/kuma: follow-up for 317fef95f9 2023-02-22 17:50:54 -08:00
config_map.go lib/promscrape: explicitly stop and cleanup service discovery routines when new config is read from -promscrape.config 2021-03-01 14:15:16 +02:00
utils_test.go lib/promscrape: optimize service discovery speed 2022-11-29 21:26:23 -08:00
utils_timing_test.go lib/promscrape: optimize discoveryutils.SanitizeLabelName() 2022-08-27 00:18:19 +03:00
utils.go lib/bytesutil: add InternBytes() function as a shortcut to InternString(ToUnsafeString(..)) 2023-01-03 22:15:49 -08:00