Limit Prometheus metric warning log RPS (#6392)

## What changed?
<!-- Describe what has changed in this PR -->
Add a metrics config to set logger RPS for prometheus. Default / 0 means
no limit.

common/metrics/config.go

@@ -109,6 +109,9 @@ type (
 		// HTTP handler path "/metrics".
 		HandlerPath string `yaml:"handlerPath"`
 
+		// LoggerRPS sets the RPS of the logger provided to prometheus. Default of 0 means no limit.
+		LoggerRPS float64 `yaml:"loggerRPS"`
+
 		// Configs below are kept for backwards compatibility with previously exposed tally prometheus.Configuration.
 
 		// Deprecated. ListenNetwork if specified will be used instead of using tcp network.
@@ -297,6 +300,10 @@ func NewScope(logger log.Logger, c *Config) tally.Scope {
 			return nil
 		}
 
+		if c.Prometheus.LoggerRPS > 0 {
+			logger = log.NewThrottledLogger(logger, func() float64 { return c.Prometheus.LoggerRPS })
+		}
+
 		return newPrometheusScope(
 			logger,
 			convertPrometheusConfigToTally(&c.ClientConfig, c.Prometheus),