k8s-cni-cache-cleanup: use ActiveEnterTimestamp

The script in k8s-cni-cache-cleanup is failing to run
because 'WatchdogTimestamp' no longer exists.

Instead we use another timestamp, namely ActiveEnterTimestamp.

Test Plan:

PASS: Lock and unlock the controller and verify that the cleanup
      works properly

PASS: Launch pods using extra cni interfaces and make sure
      they work properly using specific test cases

Closes-Bug: 1999570

Signed-off-by: Mohammad Issa <mohammad.issa@windriver.com>
Change-Id: I36881a2802d150d7b36d204bf45511752d7f8401

kubernetes/k8s-cni-cache-cleanup/centos/files/k8s-cni-cache-cleanup

@@ -130,16 +130,30 @@ function check_cache_file_age {
 function kubelet_uptime {
     local SECONDSPERMINUTE=60
 
-    kubelet_uptime=$(systemctl show kubelet --property WatchdogTimestamp | awk -F= '{print $2}')
-    [[ -n ${kubelet_uptime} ]]
-    if [ ${?} -ne 0 ]; then
-        ERROR "Failed to get kubelet uptime."
+    # Check if the kubelet service is active
+    kubelet_status=$(systemctl is-active kubelet)
+    if [ "${kubelet_status}" = "active" ]; then
+        kubelet_ts_property=$(systemctl show kubelet --property ActiveEnterTimestamp)
+        RC=${?}
+        if [ "${RC}" -eq 0 ]; then
+            kubelet_uptime=$( echo "${kubelet_ts_property}" | awk -F= '{print $2}' )
+            if [ -z "${kubelet_uptime}" ]; then
+                ERROR "Failed to get kubelet uptime, kubelet_uptime=${kubelet_uptime}"
                 minutes=0
             else
                 uptime=$(date --date="${kubelet_uptime}" +%s)
                 now=$(date +%s)
                 minutes=$(((${now}-${uptime})/${SECONDSPERMINUTE}))
             fi
+        else
+            ERROR "Failed to get kubelet uptime, RC=${RC}"
+            minutes=0
+        fi
+    else
+        # Log an error message if the kubelet service is not active
+        ERROR "The kubelet service is not active."
+        minutes=0
+    fi
 
     echo ${minutes}
 }