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:127.0.0.1:9750)
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).