Use --revert-pattern to discount proactive restarts

Author: linxiulei

config/systemd-monitor-counter.json

@@ -37,7 +37,8 @@
         "--lookback=20m",
         "--delay=5m",
         "--count=5",
-        "--pattern=Started (Kubernetes kubelet|kubelet.service|kubelet.service - Kubernetes kubelet)."
+        "--pattern=Started (Kubernetes kubelet|kubelet.service|kubelet.service - Kubernetes kubelet).",
+        "--revert-pattern=Stopping (Kubernetes kubelet|kubelet.service|kubelet.service - Kubernetes kubelet)..."
       ],
       "timeout": "1m"
     },
@@ -51,7 +52,8 @@
         "--log-path=/var/log/journal",
         "--lookback=20m",
         "--count=5",
-        "--pattern=Starting (Docker Application Container Engine|docker.service|docker.service - Docker Application Container Engine)..."
+        "--pattern=Starting (Docker Application Container Engine|docker.service|docker.service - Docker Application Container Engine)...",
+        "--revert-pattern=Stopping (Docker Application Container Engine|docker.service|docker.service - Docker Application Container Engine)..."
       ],
       "timeout": "1m"
     },
@@ -65,7 +67,8 @@
         "--log-path=/var/log/journal",
         "--lookback=20m",
         "--count=5",
-        "--pattern=Starting (containerd container runtime|containerd.service|containerd.service - containerd container runtime)..."
+        "--pattern=Starting (containerd container runtime|containerd.service|containerd.service - containerd container runtime)...",
+        "--revert-pattern=Stopping (containerd container runtime|containerd.service|containerd.service - containerd container runtime)..."
       ],
       "timeout": "1m"
     }

pkg/logcounter/log_counter.go

@@ -86,7 +86,7 @@ func (e *logCounter) Count() (count int, err error) {
 			if len(e.buffer.Match(e.pattern)) != 0 {
 				count++
 			}
-			if len(e.buffer.Match(e.revertPattern)) != 0 {
+			if e.revertPattern != "" && len(e.buffer.Match(e.revertPattern)) != 0 {
 				count--
 			}
 		case <-e.clock.After(timeout):