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docs: add notes about metrics + error logging (#747)
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| # Metrics And Logging | ||
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| > :warning: NOTE: this document serves as a starting point for debugging and does not provide an exhaustive/definitive answer | ||
| The relay exports metrics and chain-specific errors. This document identifies common metrics/logs and potential reasons for behavior. | ||
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| ## Error Logging | ||
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| [`failed to enqeue tx for simulation`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/txm/txm.go#L129) | ||
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| * indicates slow RPCs that are not responding quickly enough | ||
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| [`original signature does not match retry signature`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/txm/txm.go#L301) | ||
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| * this could indicate a race condition within the relayer code (please alert developers for investigation) | ||
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| [`failed to find transaction within confirm timeout`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/txm/txm.go#L372) | ||
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| * indicates network congestion or poor RPC performance (tx dropped) | ||
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| [`simulate: unrecognized error`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/txm/txm.go#L494) | ||
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| * There is usually an additional output within the result parameter of the error: | ||
| * `InsufficientFundsForRent`: sender balance too low | ||
| * `AccountNotFound`: sender or used account does not exist (if previously existed, could have been garbage collected) | ||
| * Additional errors + reasons can be found here: https://github.com/solana-labs/solana/blob/master/sdk/src/transaction/error.rs | ||
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| [`failed to enqeue tx`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/txm/txm.go#L528) | ||
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| * indicates slow RPC which does not respond quickly enough to keep up with the incoming stream of transactions | ||
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| [`error in ReadAnswer: stale answer data, polling is likely experiencing errors`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/transmissions_cache.go#L110C21-L110C98) | ||
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| * indicates RPC issues (most likely down) | ||
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| [`error in ReadState: stale state data, polling is likely experiencing errors`](https://github.com/smartcontractkit/chainlink-solana/blob/a2ff2b377b72d06dc85b5242d93bb2f974967145/pkg/solana/state_cache.go#L114C21-L114C96) | ||
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| * indicates RPC issues (most likely down) | ||
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| ## Metrics | ||
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| [`solana_balance`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/monitor/prom.go#L14) | ||
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| * provides the SOL balance for keys in the keystore | ||
| * low SOL balance will lead to the CL node stop transmitting | ||
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| [`solana_cache_last_update_unix`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/monitor/prom.go#L18) | ||
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| * tracks last update to cached data (unix timestamp) | ||
| * updates should occur at the configured rate (default: 1s), slower updates can indicate RPC latency issues | ||
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| [`solana_client_latency_ms`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/monitor/prom.go#L23) | ||
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| * tracks duration of each RPC request, separated via label + URLs | ||
| * spikes in latency can indicate RPC issues | ||
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| [`solana_txm_tx_success`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L10) | ||
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| * total of TXs that are confirmed and successfully executed on chain | ||
| * this value should consistently increase. If it does not, this could indicate RPC latency or funding issues. | ||
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| [`solana_txm_tx_pending`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L16) | ||
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| * current TXs that are inflight (not confirmed success or error) | ||
| * this value should stay mostly constant - spikes could indicate lagging performance due to slow RPCs. | ||
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| [`solana_txm_tx_error`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L22) | ||
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| * sum of TXs that have errored for any reason | ||
| * depending on the network configuration, this value should either be constant or increase | ||
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| [`solana_txm_tx_error_revert`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L26) | ||
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| * total of TXs that have been confirmed but error with a revert | ||
| * depending on the network configuration, this value should either be constant or increase | ||
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| [`solana_txm_tx_error_reject`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L30) | ||
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| * total of TXs that have been immediately rejected by the RPC | ||
| * value should be near zero, TXs should not be immediately rejected by the RPC. this could indicate faulty RPC or | ||
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| [`solana_txm_tx_error_drop`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L34) | ||
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| * total of TXs that have been broadcast to the network but was not confirmed within the configured timeout | ||
| * an increasing value can indicate RPC latency issues or network congestion | ||
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| [`solana_txm_tx_error_sim_revert`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L38) | ||
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| * total of TXs that reverted during simulation | ||
| * value should not increase rapidly and should be low, if it does it may indicate misconfiguration on the CL node or onchain | ||
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| [`solana_txm_tx_error_sim_other`](https://github.com/smartcontractkit/chainlink-solana/blob/4ca9bcc8264d89c7527897e729281e13f37852f1/pkg/solana/txm/prom.go#L38) | ||
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| * total of TXs that failed during simulation with an unrecognized error | ||
| * value should not increase rapdily and should be low, requires looking through logs for the unrecognized error and diagnosing further from there | ||
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