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d60388134d
Currently we track a key metric `PEERS_PER_COLUMN_SUBNET` in a getter `good_peers_on_sampling_subnets`. Another PR https://github.com/sigp/lighthouse/pull/6922 deletes that function, so we have to move the metric anyway. This PR moves that metric computation to the metrics spawned task which is refreshed every 5 seconds. I also added a few more useful metrics. The total set and intended usage is: - `sync_peers_per_column_subnet`: Track health of overall subnets in your node - `sync_peers_per_custody_column_subnet`: Track health of the subnets your node needs. We should track this metric closely in our dashboards with a heatmap and bar plot - ~~`sync_column_subnets_with_zero_peers`: Is equivalent to the Grafana query `count(sync_peers_per_column_subnet == 0) by (instance)`. We may prefer to skip it, but I believe it's the most important metric as if `sync_column_subnets_with_zero_peers > 0` your node stalls.~~ - ~~`sync_custody_column_subnets_with_zero_peers`: `count(sync_peers_per_custody_column_subnet == 0) by (instance)`~~