Merge pull request #41147 from derekwaynecarr/improve-eviction-logs

Automatic merge from submit-queue (batch tested with PRs 41074, 41147, 40854, 41167, 40045)

Add debug logging to eviction manager

**What this PR does / why we need it**:
This PR adds debug logging to eviction manager.

We need it to help users understand when/why eviction manager is/is not making decisions to support information gathering during support.

hack/local-up-cluster.sh

@@ -41,6 +41,11 @@ CGROUP_ROOT=${CGROUP_ROOT:-""}
 # name of the cgroup driver, i.e. cgroupfs or systemd
 CGROUP_DRIVER=${CGROUP_DRIVER:-""}
 
+# enables testing eviction scenarios locally.
+EVICTION_HARD=${EVICTION_HARD:-"memory.available<100Mi"}
+EVICTION_SOFT=${EVICTION_SOFT:-""}
+EVICTION_PRESSURE_TRANSITION_PERIOD=${EVICTION_PRESSURE_TRANSITION_PERIOD:-"1m"}
+
 # We disable cluster DNS by default because this script uses docker0 (or whatever
 # container bridge docker is currently using) and we don't know the IP of the
 # DNS pod to pass in as --cluster-dns. To set this up by hand, set this flag
@@ -558,6 +563,9 @@ function start_kubelet {
         --cgroup-driver=${CGROUP_DRIVER} \
         --cgroup-root=${CGROUP_ROOT} \
         --keep-terminated-pod-volumes=true \
+        --eviction-hard=${EVICTION_HARD} \
+        --eviction-soft=${EVICTION_SOFT} \
+        --eviction-pressure-transition-period=${EVICTION_PRESSURE_TRANSITION_PERIOD} \
         ${auth_args} \
         ${dns_args} \
         ${net_plugin_dir_args} \