chore: extract DefaultMetricCardinalityLimit to avoid duplicate literal

Author: pkcll

pkg/beholder/config.go

@@ -41,7 +41,7 @@ type Config struct {
 	MetricRetryConfig    *RetryConfig
 	MetricViews []metric.View
 	// MetricCardinalityLimit sets the SDK per-instrument attribute-set limit (0 = disabled).
-	// DefaultConfig uses 100000 as a production safety valve for high-cardinality workloads.
+	// DefaultConfig uses DefaultMetricCardinalityLimit as a production safety valve for high-cardinality workloads.
 	MetricCardinalityLimit int
 	// MetricCompressor sets the gRPC compressor for metrics. Valid values: "gzip" (default), "none".
 	MetricCompressor string
@@ -111,6 +111,9 @@ var defaultRetryConfig = RetryConfig{
 const (
 	defaultPackageName        = "beholder"
 	defaultMaxConcurrentSends = 10
+
+	// DefaultMetricCardinalityLimit is the production safety valve for high-cardinality workloads.
+	DefaultMetricCardinalityLimit = 100000
 )
 
 var defaultOtelAttributes = []attribute.KeyValue{
@@ -142,7 +145,7 @@ func DefaultConfig() Config {
 		// Metric
 		MetricReaderInterval:   1 * time.Second,
 		MetricCompressor:       "gzip",
-		MetricCardinalityLimit: 100000,
+		MetricCardinalityLimit: DefaultMetricCardinalityLimit,
 		// OTel metric exporter retry config
 		MetricRetryConfig: defaultRetryConfig.Copy(),
 		// Log

pkg/loop/config.go

@@ -11,6 +11,7 @@ import (
 	"github.com/hashicorp/go-plugin"
 	"go.uber.org/zap/zapcore"
 
+	"github.com/smartcontractkit/chainlink-common/pkg/beholder"
 	"github.com/smartcontractkit/chainlink-common/pkg/config"
 	"github.com/smartcontractkit/chainlink-common/pkg/settings/cresettings"
 )
@@ -548,7 +549,7 @@ func (e *EnvConfig) parse() error {
 			}
 			e.TelemetryMetricCardinalityLimit = &limit
 		} else {
-			defaultLimit := 100000
+			defaultLimit := beholder.DefaultMetricCardinalityLimit
 			e.TelemetryMetricCardinalityLimit = &defaultLimit
 		}
 		e.TelemetryPrometheusBridgeEnabled, err = getBool(envTelemetryPrometheusBridgeEnabled)