containerd/docs/telemetry.md

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# Telemetry
Currently containerd only outputs metrics to stdout but will support dumping to various backends in the future.
```
[containerd] 2015/12/16 11:48:28 timer container-start-time
[containerd] 2015/12/16 11:48:28 count: 22
[containerd] 2015/12/16 11:48:28 min: 25425883
[containerd] 2015/12/16 11:48:28 max: 113077691
[containerd] 2015/12/16 11:48:28 mean: 68386923.27
[containerd] 2015/12/16 11:48:28 stddev: 20928453.26
[containerd] 2015/12/16 11:48:28 median: 65489003.50
[containerd] 2015/12/16 11:48:28 75%: 82393210.50
[containerd] 2015/12/16 11:48:28 95%: 112267814.75
[containerd] 2015/12/16 11:48:28 99%: 113077691.00
[containerd] 2015/12/16 11:48:28 99.9%: 113077691.00
[containerd] 2015/12/16 11:48:28 1-min rate: 0.00
[containerd] 2015/12/16 11:48:28 5-min rate: 0.01
[containerd] 2015/12/16 11:48:28 15-min rate: 0.01
[containerd] 2015/12/16 11:48:28 mean rate: 0.03
[containerd] 2015/12/16 11:48:28 counter containers
[containerd] 2015/12/16 11:48:28 count: 1
[containerd] 2015/12/16 11:48:28 counter events
[containerd] 2015/12/16 11:48:28 count: 87
[containerd] 2015/12/16 11:48:28 counter events-subscribers
[containerd] 2015/12/16 11:48:28 count: 2
[containerd] 2015/12/16 11:48:28 gauge goroutines
[containerd] 2015/12/16 11:48:28 value: 38
[containerd] 2015/12/16 11:48:28 gauge fds
[containerd] 2015/12/16 11:48:28 value: 18
```