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---
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layout: "docs"
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page_title: "Telemetry"
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sidebar_current: "docs-agent-telemetry"
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---
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# Telemetry
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2014-02-18 23:30:07 +00:00
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The Consul agent collects various metrics data at runtime about the performance
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of different libraries and sub-systems. These metrics are aggregated on a ten second
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interval and are retained for one minute.
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2014-02-18 23:30:07 +00:00
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To view the telemetry information, you must send a `USR1` signal to the Consul
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process. Windows users must use the `BREAK` signal instead.
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Once Consul receives the signal, it will dump the current telemetry
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information to the stderr of the agent.
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In general, the telemetry information is used for debugging or otherwise
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getting a better view into what Consul is doing.
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2014-04-04 21:55:23 +00:00
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Additionally, if the `-statsite` [option](/docs/agent/options.html) is provided,
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then the telemetry information will be streamed to a [statsite](github.com/armon/statsite)
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server where it can be aggregate and flushed to Graphite or any other metrics store.
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2014-02-08 00:41:03 +00:00
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Below is an example output:
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```
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.num_goroutines': 19.000
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.alloc_bytes': 755960.000
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.malloc_count': 7550.000
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.free_count': 4387.000
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.heap_objects': 3163.000
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.total_gc_pause_ns': 1151002.000
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[2014-01-29 10:56:50 -0800 PST][G] 'consul-agent.runtime.total_gc_runs': 4.000
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[2014-01-29 10:56:50 -0800 PST][C] 'consul-agent.agent.ipc.accept': Count: 5 Sum: 5.000
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[2014-01-29 10:56:50 -0800 PST][C] 'consul-agent.agent.ipc.command': Count: 10 Sum: 10.000
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[2014-01-29 10:56:50 -0800 PST][C] 'consul-agent.serf.events': Count: 5 Sum: 5.000
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[2014-01-29 10:56:50 -0800 PST][C] 'consul-agent.serf.events.foo': Count: 4 Sum: 4.000
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[2014-01-29 10:56:50 -0800 PST][C] 'consul-agent.serf.events.baz': Count: 1 Sum: 1.000
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[2014-01-29 10:56:50 -0800 PST][S] 'consul-agent.memberlist.gossip': Count: 50 Min: 0.007 Mean: 0.020 Max: 0.041 Stddev: 0.007 Sum: 0.989
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[2014-01-29 10:56:50 -0800 PST][S] 'consul-agent.serf.queue.Intent': Count: 10 Sum: 0.000
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[2014-01-29 10:56:50 -0800 PST][S] 'consul-agent.serf.queue.Event': Count: 10 Min: 0.000 Mean: 2.500 Max: 5.000 Stddev: 2.121 Sum: 25.000
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```
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