Shorten links to Prometheus console in alertmanager UI.

Change-Id: Id22736ba573b031bc88b95442fa04e71893a52ae

manager/notifier.go

@@ -160,6 +160,11 @@ func writeEmailBody(w io.Writer, event *Event) error {
 	if err := bodyTmpl.Execute(w, event); err != nil {
 		return err
 	}
+	buf := &bytes.Buffer{}
+	if err := bodyTmpl.Execute(buf, event); err != nil {
+		return err
+	}
+	log.Println(buf.String())
 	return nil
 }
 

web/helpers.go

@@ -19,10 +19,6 @@ import (
 	"time"
 )
 
-func timeSince(t time.Time) string {
-	return time.Now().Round(time.Second / 10).Sub(t.Round(time.Second / 10)).String()
-}
-
 // By Russ Cox, https://groups.google.com/d/msg/golang-nuts/OEdSDgEC7js/iyhU9DW_IKcJ.
 func eq(args ...interface{}) bool {
 	if len(args) == 0 {
@@ -47,7 +43,19 @@ func eq(args ...interface{}) bool {
 	return false
 }
 
-var webHelpers = template.FuncMap{
-	"timeSince": timeSince,
-	"eq":        eq,
+func timeSince(t time.Time) string {
+	return time.Now().Round(time.Second / 10).Sub(t.Round(time.Second / 10)).String()
+}
+
+func truncate(str string, n int) string {
+	if len(str) <= n {
+		return str
+	}
+	return str[:n] + "..."
+}
+
+var webHelpers = template.FuncMap{
+	"eq":        eq,
+	"timeSince": timeSince,
+	"truncate":  truncate,
 }

web/templates/alerts.html

@@ -46,7 +46,7 @@
             </td>
             <td>{{timeSince .Created}} ago</td>
             <td>{{timeSince .LastRefreshed}} ago</td>
-            <td><a href="{{.Event.Payload.GeneratorUrl}}">{{.Event.Payload.GeneratorUrl}}</a></td>
+            <td><a href="{{.Event.Payload.GeneratorUrl}}">{{(truncate .Event.Payload.GeneratorUrl 40)}}</a></td>
             <td>{{.Event.Payload.AlertingRule}}</td>
             <td>
               {{$silence := call $silenceForEvent .Event}}