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# Metrics
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2018-06-16 00:13:41 -07:00
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Tendermint can report and serve the Prometheus metrics, which in their turn can
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be consumed by Prometheus collector(s).
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2018-06-15 06:33:44 -07:00
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2018-06-16 00:13:41 -07:00
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This functionality is disabled by default.
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To enable the Prometheus metrics, set `instrumentation.prometheus=true` if your
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config file. Metrics will be served under `/metrics` on 26660 port by default.
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Listen address can be changed in the config file (see
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2018-06-20 07:38:42 -07:00
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`instrumentation.prometheus_listen_addr`).
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2018-06-15 06:33:44 -07:00
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## List of available metrics
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2018-06-16 00:13:41 -07:00
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The following metrics are available:
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2018-06-20 07:38:42 -07:00
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```
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| Name | Type | Since | Description |
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| --------------------------------------- | ------- | --------- | ----------------------------------------------------------------------------- |
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| consensus_height | Gauge | 0.21.0 | Height of the chain |
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| consensus_validators | Gauge | 0.21.0 | Number of validators |
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| consensus_validators_power | Gauge | 0.21.0 | Total voting power of all validators |
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| consensus_missing_validators | Gauge | 0.21.0 | Number of validators who did not sign |
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| consensus_missing_validators_power | Gauge | 0.21.0 | Total voting power of the missing validators |
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| consensus_byzantine_validators | Gauge | 0.21.0 | Number of validators who tried to double sign |
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| consensus_byzantine_validators_power | Gauge | 0.21.0 | Total voting power of the byzantine validators |
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| consensus_block_interval_seconds | Histogram | 0.21.0 | Time between this and last block (Block.Header.Time) in seconds |
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| consensus_rounds | Gauge | 0.21.0 | Number of rounds |
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| consensus_num_txs | Gauge | 0.21.0 | Number of transactions |
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| mempool_size | Gauge | 0.21.0 | Number of uncommitted transactions |
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| consensus_total_txs | Gauge | 0.21.0 | Total number of transactions committed |
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| consensus_block_size_bytes | Gauge | 0.21.0 | Block size in bytes |
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| p2p_peers | Gauge | 0.21.0 | Number of peers node's connected to |
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```
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2018-06-15 06:38:46 -07:00
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## Useful queries
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Percentage of missing + byzantine validators:
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```
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((consensus_byzantine_validators_power + consensus_missing_validators_power) / consensus_validators_power) * 100
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```
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