feat: add simulate errors metrics

.changelog/unreleased/features/3845-add-simulate-errors-metric.md

@@ -0,0 +1,2 @@
+- Added simulate errors metric for Prometheus
+  ([\#3845](https://github.com/informalsystems/hermes/issues/3845))

crates/relayer/src/chain/cosmos/estimate.rs

@@ -14,6 +14,7 @@ use crate::chain::cosmos::types::gas::GasConfig;
 use crate::config::types::Memo;
 use crate::error::Error;
 use crate::keyring::Secp256k1KeyPair;
+use crate::telemetry;
 use crate::util::pretty::PrettyFee;
 
 pub async fn estimate_tx_fees(
@@ -51,6 +52,7 @@ pub async fn estimate_tx_fees(
         &config.rpc_address,
         &config.chain_id,
         tx,
+        account,
     )
     .await?;
 
@@ -63,6 +65,7 @@ async fn estimate_fee_with_tx(
     rpc_address: &Url,
     chain_id: &ChainId,
     tx: Tx,
+    account: &Account,
 ) -> Result<Fee, Error> {
     let estimated_gas = {
         crate::time!(
@@ -72,7 +75,7 @@ async fn estimate_fee_with_tx(
             }
 
         );
-        estimate_gas_with_tx(gas_config, grpc_address, tx).await
+        estimate_gas_with_tx(gas_config, grpc_address, tx, account).await
     }?;
 
     if estimated_gas > gas_config.max_gas {
@@ -112,6 +115,7 @@ async fn estimate_gas_with_tx(
     gas_config: &GasConfig,
     grpc_address: &Uri,
     tx: Tx,
+    account: &Account,
 ) -> Result<u64, Error> {
     let simulated_gas = send_tx_simulate(grpc_address, tx)
         .await
@@ -147,6 +151,13 @@ async fn estimate_gas_with_tx(
                 e.detail()
             );
 
+            telemetry!(
+                simulate_errors,
+                &account.address.to_string(),
+                true,
+                get_error_text(&e),
+            );
+
             Ok(gas_config.default_gas)
         }
 
@@ -155,6 +166,14 @@ async fn estimate_gas_with_tx(
                 "failed to simulate tx. propagating error to caller: {}",
                 e.detail()
             );
+
+            telemetry!(
+                simulate_errors,
+                &account.address.to_string(),
+                false,
+                get_error_text(&e),
+            );
+
             // Propagate the error, the retrying mechanism at caller may catch & retry.
             Err(e)
         }
@@ -175,3 +194,12 @@ fn can_recover_from_simulation_failure(e: &Error) -> bool {
         _ => false,
     }
 }
+
+fn get_error_text(e: &Error) -> String {
+    use crate::error::ErrorDetail::*;
+
+    match e.detail() {
+        GrpcStatus(detail) => detail.status.code().to_string(),
+        detail => detail.to_string(),
+    }
+}

crates/telemetry/src/state.rs

@@ -201,6 +201,9 @@ pub struct TelemetryState {
     /// Number of errors observed by Hermes when broadcasting a Tx
     broadcast_errors: Counter<u64>,
 
+    /// Number of errors observed by Hermes when simulating a Tx
+    simulate_errors: Counter<u64>,
+
     /// The EIP-1559 base fee queried
     dynamic_gas_queried_fees: ObservableGauge<f64>,
 
@@ -394,6 +397,13 @@ impl TelemetryState {
                 )
                 .init(),
 
+            simulate_errors: meter
+                .u64_counter("simulate_errors")
+                .with_description(
+                    "Number of errors observed by Hermes when simulating a Tx",
+                )
+                .init(),
+
             dynamic_gas_queried_fees: meter
                 .f64_observable_gauge("dynamic_gas_queried_fees")
                 .with_description("The EIP-1559 base fee queried")
@@ -1160,6 +1170,20 @@ impl TelemetryState {
         self.broadcast_errors.add(&cx, 1, labels);
     }
 
+    /// Add an error and its description to the list of errors observed after simulating
+    /// a Tx with a specific account.
+    pub fn simulate_errors(&self, address: &String, recoverable: bool, error_description: String) {
+        let cx = Context::current();
+
+        let labels = &[
+            KeyValue::new("account", address.to_string()),
+            KeyValue::new("recoverable", recoverable.to_string()),
+            KeyValue::new("error_description", error_description.to_owned()),
+        ];
+
+        self.simulate_errors.add(&cx, 1, labels);
+    }
+
     pub fn dynamic_gas_queried_fees(&self, chain_id: &ChainId, amount: f64) {
         let cx = Context::current();
 

guide/src/documentation/telemetry/operators.md

@@ -142,6 +142,7 @@ If this metric is increasing, it signals that the packet queue is increasing and
 | `cleared_send_packet_count_total`    | Number of SendPacket events received during the initial and periodic clearing, per chain, counterparty chain, channel and port                                              | `u64` Counter       | Packet workers enabled, and periodic packet clearing or clear on start enabled |
 | `cleared_acknowledgment_count_total` | Number of WriteAcknowledgement events received during the initial and periodic clearing, per chain, counterparty chain, channel and port                                    | `u64` Counter       | Packet workers enabled, and periodic packet clearing or clear on start enabled |
 | `broadcast_errors_total`        | Number of errors observed by Hermes when broadcasting a Tx, per error type and account                                                                                                         | `u64` Counter       | Packet workers enabled |
+| `simulate_errors_total`        | Number of errors observed by Hermes when simulating a Tx, per error type, account and whether the error is recoverable or not                                 | `u64` Counter       | Packet workers enabled |
 | `filtered_packets`        | Number of ICS-20 packets filtered because the memo and/or the receiver fields were exceeding the configured limits | `u64` Counter | Packet workers enabled, and `ics20_max_memo_size` and/or `ics20_max_receiver_size` enabled |
 
 Notes: