Monitoring

Health endpoints

The node exposes CometBFT RPC on port 26657 (localhost only):

Endpoint	Description
`http://localhost:26657/health`	Returns `{}` if running
`http://localhost:26657/status`	Sync status, validator info, latest block
`http://localhost:26657/net_info`	Peer count and connections

autheod status | jq '.SyncInfo.catching_up'
autheod status | jq '.SyncInfo.latest_block_height'

Edit config/config.toml:

[instrumentation]
prometheus = true
prometheus_listen_addr = "127.0.0.1:26660"

sudo systemctl restart autheod
curl -s http://localhost:26660/metrics | head -20

Port 26660 must never be exposed publicly. Proxy through your monitoring stack over private network only.

Metric	Alert threshold	Meaning
`tendermint_consensus_height`	No increase for >60s	Block production stopped
`tendermint_consensus_validator_power`	= 0	Validator jailed or tombstoned
`tendermint_p2p_peers`	< 3	Too few peers; sync at risk
`tendermint_consensus_rounds`	Consistently > 1	Network consensus trouble
`tendermint_mempool_size`	> 4,500	Mempool near capacity
`process_resident_memory_bytes`	> 85% of total RAM	Memory pressure; OOM risk
`go_goroutines`	> 5,000	Possible goroutine leak
`process_open_fds`	> 90% of limit	Increase `LimitNOFILE`

Install Prometheus and configure scraping

Add http://localhost:26660/metrics as a scrape target.

Install Grafana and add data source

Add Prometheus at http://localhost:9090.

Import community dashboard

Dashboards → Import → Dashboard ID 11036 (Cosmos/CometBFT community dashboard).

Configure alerts

Set up Alertmanager alerts for validator_power = 0, peer count < 3, and block height stall.

sudo journalctl -u autheod -f
sudo journalctl -u autheod -f | grep '"level":"error"'

Key log patterns:

Pattern	Meaning
`"level":"error"`	Any error condition
`"jailed"`	Validator jailed
`"tombstoned"`	Permanent ban — act immediately
`"license"` with error	License state transition failure