update README.md

Signed-off-by: Adarsh-verma-14 <t_adarsh.verma@india.nec.com>

keda/README.md

@@ -161,6 +161,7 @@ their default values.
 | `image.metricsApiServer.repository` | string | `"ghcr.io/kedacore/keda-metrics-apiserver"` | Image name of KEDA Metrics API Server |
 | `image.metricsApiServer.tag` | string | `""` | Image tag of KEDA Metrics API Server. Optional, given app version of Helm chart is used by default |
 | `logging.metricServer.level` | int | `0` | Logging level for Metrics Server. allowed values: `0` for info, `4` for debug, or an integer value greater than 0, specified as string |
+| `logging.metricServer.stderrthreshold` | string | `"ERROR"` | Logging stderrthreshold for Metrics Server allowed values: 'DEBUG','INFO','WARN','ERROR','ALERT','EMERG' |
 | `metricsServer.affinity` | object | `{}` | [Affinity] for pod scheduling for Metrics API Server. Takes precedence over the `affinity` field |
 | `metricsServer.dnsPolicy` | string | `"ClusterFirst"` | Defined the DNS policy for the metric server |
 | `metricsServer.replicaCount` | int | `1` | Capability to configure the number of replicas for KEDA metric server. While you can run more replicas of our metric server, only one instance will used and serve traffic. You can run multiple replicas, but they will not improve the performance of KEDA, it could only reduce downtime during a failover. Learn more in [our documentation](https://keda.sh/docs/latest/operate/cluster/#high-availability). |