Second Ethereum RPC metrics are not tracked

Do you want to request a feature or report a bug?
Bug

What is the current behavior?
When adding a second Ethereum RPC, we lose visibility in Grafana of the time for eth_getLogs calls - deployment_eth_rpc_request_duration. This was done recently for the matic network on the Hosted Service.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.
Add two Ethereum RPCs, the second of which should be a non-archive node (so it is used for eth_getLogs calls). The deployment_eth_rpc_request_duration is no longer tracked. eth_call duration will be tracked (as those hit the archive URL)

Hypothesis: possibly graph node tries to register the same metric twice, one for each url, which is an error

What is the expected behavior?
Metrics should be tracked for all nodes - ideally we should also be able to distinguish metrics by node?

La issue non indica file né test. Inizia riproducendo la configurazione con due RPC Ethereum, quindi segui la registrazione e la raccolta di deployment_eth_rpc_request_duration per eth_getLogs e eth_call. Il lavoro è completato quando le metriche della durata delle richieste rimangono disponibili per ogni nodo configurato, idealmente distinguibili per nodo.