Metrics.Rpcval update_metrics :
string ->
string ->
(unit -> Cohttp_lwt_unix.Server.response_action Lwt.t) ->
Cohttp_lwt_unix.Server.response_action Lwt.tupdate_metrics uri method_name callback updates the metrics related to the given uri and more specifically the given method_name.
This function is expected to be passed as an argument of Tezos_rpc_http_server.RPC_middleware.rpc_metrics_transform_callback.