[document] add example for adding a widget chart link on an customizable alert.

Author: gunlee01

scouter.document/main/Alert-Plugin-Guide.md

@@ -51,28 +51,41 @@ Alert script file can be edited from scouter client ui or directly in scouter se
      * alert when ```GcTime``` is over than 2 sec
       ```java
       // void process(RealCounter $counter, PluginHelper $$)
+      //################ widget chart url setting ####################
+      String counterName = "TPS";
       String objType = $counter.objType();
       String objName = $counter.objName();
 
-      String widgetUrl = "http://127.0.0.1:6180/widget/simple/counter.html?source="
+      java.text.SimpleDateFormat dateFormat = new java.text.SimpleDateFormat("yyyyMMdd");
+      long now = System.currentTimeMillis();
+      String today = dateFormat.format(new java.util.Date(now));
+      String yesterday = dateFormat.format(new java.util.Date(now-24*60*60*1000));
 
-      String counterApi5Min = "TPS/ofType/" + objType;
-      counterApi5Min += "?startTimeMillis=" + (System.currentTimeMillis()-300*1000);
-      counterApi5Min += "?endTimeMillis=" + System.currentTimeMillis();
+      String widgetUrl = "http://127.0.0.1:6180/widget/simple/counter.html?source=";
 
-      String counterApiLatest5Min = "TPS/latest/300/ofType" + objType;
+      String counterApi = counterName + "/ofType/" + objType;
+      counterApi += "?startTimeMillis=" + (now-600*1000L);
+      counterApi += "&endTimeMillis=" + now;
+
+      String counterApiLatest = counterName + "/latest/600/ofType/" + objType;
+
+      String statApi = "stat/" + counterName + "/ofType/" + objType;
+      statApi += "?startYmd=" + yesterday;
+      statApi += "&endYmd=" + today;
+      //##############################################################
 
       int gcTime = $counter.intValue();
       if(gcTime > 2000) {
-         String message = "gc time:" + respTime + "ms";
-
-         message = "\n[Check TPS]\n";
-         message += widgetUrl + java.net.UrlEncoder.encode(counterApi5Min) + "\n";
+        String message = "gc time:" + respTime + "ms\n";
 
-         message += "[Current 5 min TPS]\n";
-         message += widgetUrl + java.net.UrlEncoder.encode(counterApiLatest5Min) + "\n";
+        message = "[On-time chart]\n";
+        message += widgetUrl + java.net.URLEncoder.encode(counterApi) + "\n";
+        message += "[Current chart]\n";
+        message += widgetUrl + java.net.URLEncoder.encode(counterApiLatest) + "\n";
+        message += "[Daily chart]\n";
+        message += widgetUrl + java.net.URLEncoder.encode(statApi) + "\n";
 
-         $counter.fatal("gc time fatal", message);
+        $counter.fatal("gc time fatal", message);
       }
       ```
    * sample2 (**Elasped90%.alert**)