updating gaslimit logs

changelog/james-prysm_gas-limit-logs.md

@@ -0,0 +1,3 @@
+### Added
+
+- additional logs when setting or not setting the gas limit for mev builders

config/proposer/loader/loader.go

@@ -67,6 +67,8 @@ func WithGasLimit() SettingsLoaderOption {
 			}
 			if gl == 0 {
 				log.Warnf("Gas limit was intentionally set to 0, this will be replaced with the default gas limit of %d", params.BeaconConfig().DefaultBuilderGasLimit)
+			} else {
+				log.Warnf("Setting a global gas limit of %d for mev builder", gl)
 			}
 			rgl := reviewGasLimit(validator.Uint64(gl))
 			psl.options.gasLimit = &rgl
@@ -276,6 +278,7 @@ func mergeProposerSettings(loaded, db *validatorpb.ProposerSettingsPayload, opti
 			db.DefaultConfig.Builder = nil
 		}
 	}
+
 	if loaded != nil && loaded.DefaultConfig != nil {
 		merged.DefaultConfig = loaded.DefaultConfig
 	}
@@ -295,6 +298,10 @@ func mergeProposerSettings(loaded, db *validatorpb.ProposerSettingsPayload, opti
 	}
 
 	if merged.DefaultConfig != nil {
+		if merged.DefaultConfig.Builder != nil && merged.DefaultConfig.Builder.Enabled && merged.DefaultConfig.Builder.GasLimit == 0 && gasLimitOnly == nil {
+			log.Warnf("Builder was enabled but no gas limit was specified so the global default of %d is used. Add a gas_limit field or use the --%s flag to lower the log level.",
+				params.BeaconConfig().DefaultBuilderGasLimit, flags.BuilderGasLimitFlag.Name)
+		}
 		merged.DefaultConfig.Builder = processBuilderConfig(merged.DefaultConfig.Builder, builderConfig, gasLimitOnly)
 	}
 	for _, option := range merged.ProposerConfig {

config/proposer/loader/loader_test.go

@@ -259,6 +259,7 @@ func TestProposerSettingsLoader(t *testing.T) {
 					},
 				}
 			},
+			wantLog: fmt.Sprintf("Builder was enabled but no gas limit was specified so the global default of %d is used.", params.BeaconConfig().DefaultBuilderGasLimit),
 		},
 		{
 			name: "Happy Path Config file File, bad checksum",
@@ -477,6 +478,7 @@ func TestProposerSettingsLoader(t *testing.T) {
 			},
 			wantErr:                      "",
 			validatorRegistrationEnabled: true,
+			wantLog:                      "Setting a global gas limit of 50000000 for mev builder",
 		},
 		{
 			name: "File with default gas that overrides",