add more useful queries
@@ -83,3 +83,26 @@ Number of non-mutating API requests being made to the control plane.
Top 10 pods doing the most receive network traffic
+### etcd related queries
+
+> etcd_disk_wal_fsync_duration_seconds_count{type="master"}
+
+etcd "write-ahead-log" latency in milliseconds. If this goes over 100ms, the cluster might destabilize. Over 1000ms and things definitely start falling apart.
+
+### Kubelet / docker related queries
+
+> kubelet_docker_operations_latency_microseconds{type="compute",quantile="0.9"}
+
+90th percentile latency for docker operations (in microseconds). This number will include image pulls, so often will be hundreds of seconds.
+
+> kubelet_docker_operations_timeout
+
+Returns a running count (not a rate) of docker operations that have timed out since the kubelet was started.
+
+> kubelet_docker_operations_errors
+
+Returns a running count (not a rate) of docker operations that have failed since the kubelet was started.
+
+> kubelet_pleg_relist_latency_microseconds
+
+Returns PLEG (pod lifecycle event generator) latency metrics. This represents the latency experienced by calls from the kubelet to the container runtime (i.e. docker or CRI-O). High PLEG latency is often related to disk I/O performance on the docker storage partition.
