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This metric is useful on initial sync, when bitcoind is already synced, but lightningd is still working through the blocks. Comparing the two measures allows to calculate the indexing progress.
Prometheus plugin for c-lightning
This plugin exposes some key metrics from c-lightning in the prometheus format so it can be scraped, plotted and alerts can be created on it. The plugin adds the following command line arguments:
prometheus-listen: the IP address and port to bind the HTTP server to (default:0.0.0.0:9900)
Exposed variables include:
node: ID, version, ...peers: whether they are connected, and how many channels are currently openchannels: fund allocations, spendable funds, and how many unresolved HTLCs are currently attached to the channelfunds: satoshis in on-chain outputs, satoshis allocated to channels and total sum (may be inaccurate during channel resolution).