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The `solana-watchtower` program is used to monitor the health of a cluster. It
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periodically polls the cluster over an RPC API to confirm that the transaction
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count is advancing, new blockhashes are available, and no validators are
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delinquent. Results are reported as InfluxDB metrics, with an optional
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Slack/Discord push notification on sanity failure.
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If you only care about the health of one specific validator, the
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`--validator-identity` command-line argument can be used to restrict failure
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notifications to issues only affecting that validator.
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### Metrics
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#### `watchtower-sanity`
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On every iteration this data point will be emitted indicating the overall result
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using a boolean `ok` field.
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#### `watchtower-sanity-failure`
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On failure this data point contains details about the specific test that failed via
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the following fields:
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* `test`: name of the sanity test that failed
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* `err`: exact sanity failure message
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### Sanity failure push notification
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To receive a Slack, Discord and/or Telgram notification on sanity failure,
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define environment variables before running `solana-watchtower`:
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```
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export SLACK_WEBHOOK=...
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export DISCORD_WEBHOOK=...
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```
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Telgram requires the following two variables:
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```
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export TELEGRAM_BOT_TOKEN=...
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export TELEGRAM_CHAT_ID=...
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```
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