Log non-zero expvars periodically #1955
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Not ready for merging, but discussion/reviews welcome. |
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Example log line: |
| @@ -21,8 +24,18 @@ type Logging struct { | |||
| ToSyslog *bool `config:"to_syslog"` | |||
| ToFiles *bool `config:"to_files"` | |||
| Level string | |||
| Metrics LoggingMetricsConfig `config:"metrics"` | |||
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+1. Should we enable this by default?
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It is enabled by default with a 30s interval.
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Now I see it on line 170. Would probably make sense to also use a ucfg defaultConfig.
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@tsg For the above: I didn't mean as part of this PR.
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I tried initially but didn't work out due to circular imports (cfgfile imports logp).
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LGTM |
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Added docs and a basic system test. @ruflin, can you have a look before I squash? |
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LGTM |
Prints the delta since the last period, if it's non-zero. The idea is to help with troubleshooting while still creating relatively little output in the logs. 30s seems like a good compromise. Part of/related to elastic#1931
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| func snapshotExpvars(varsMap map[string]int64) { | ||
| expvar.Do(func(kv expvar.KeyValue) { | ||
| switch kv.Value.(type) { | ||
| case *expvar.Int: |
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I think this PR covers the most important metrics for the time being so no action is required at the moment IMO. We can improve this when we add "metrics" within beats. We have some expvar metrics that are nested within a map that won't be printed by this. For example, in Metricbeat we have a fetches.mysql-info.failures metric that is nested two levels deep in maps.
Prints the delta since the last period, if it's non-zero. The idea is
to help with troubleshooting while still creating relatively little output
in the logs. 30s seems like a good compromise.
Part of/related to #1931