feat: update alert email template

config/email.tmpl

@@ -1,16 +1,36 @@
 {{ define "email.to.html" }}
-{{ range .Alerts }}
-<!-- Begin of OpenIM Alert -->
-<div style="border:1px solid #ccc; padding:10px; margin-bottom:10px;">
-    <h3>OpenIM Alert</h3>
-    <p><strong>Alert Program:</strong> Prometheus Alert</p>
-    <p><strong>Severity Level:</strong> {{ .Labels.severity }}</p>
-    <p><strong>Alert Type:</strong> {{ .Labels.alertname }}</p>
-    <p><strong>Affected Host:</strong> {{ .Labels.instance }}</p>
-    <p><strong>Affected Service:</strong> {{ .Labels.job }}</p>
-    <p><strong>Alert Subject:</strong> {{ .Annotations.summary }}</p>
-    <p><strong>Trigger Time:</strong> {{ .StartsAt.Format "2006-01-02 15:04:05" }}</p>
-</div>
+{{ if eq .Status "firing" }}
+    {{ range .Alerts }}
+    <!-- Begin of OpenIM Alert -->
+    <div style="border:1px solid #ccc; padding:10px; margin-bottom:10px;">
+        <h3>OpenIM Alert</h3>
+        <p><strong>Alert Status:</strong> firing</p>
+        <p><strong>Alert Program:</strong> Prometheus Alert</p>
+        <p><strong>Severity Level:</strong> {{ .Labels.severity }}</p>
+        <p><strong>Alert Type:</strong> {{ .Labels.alertname }}</p>
+        <p><strong>Affected Host:</strong> {{ .Labels.instance }}</p>
+        <p><strong>Affected Service:</strong> {{ .Labels.job }}</p>
+        <p><strong>Alert Subject:</strong> {{ .Annotations.summary }}</p>
+        <p><strong>Trigger Time:</strong> {{ .StartsAt.Format "2006-01-02 15:04:05" }}</p>
+    </div>
+    {{ end }}
+
+
+{{ else if eq .Status "resolved" }}
+    {{ range .Alerts }}
+    <!-- Begin of OpenIM Alert -->
+    <div style="border:1px solid #ccc; padding:10px; margin-bottom:10px;">
+        <h3>OpenIM Alert</h3>
+        <p><strong>Alert Status:</strong> resolved</p>
+        <p><strong>Alert Program:</strong> Prometheus Alert</p>
+        <p><strong>Severity Level:</strong> {{ .Labels.severity }}</p>
+        <p><strong>Alert Type:</strong> {{ .Labels.alertname }}</p>
+        <p><strong>Affected Host:</strong> {{ .Labels.instance }}</p>
+        <p><strong>Affected Service:</strong> {{ .Labels.job }}</p>
+        <p><strong>Alert Subject:</strong> {{ .Annotations.summary }}</p>
+        <p><strong>Trigger Time:</strong> {{ .StartsAt.Format "2006-01-02 15:04:05" }}</p>
+    </div>
+    {{ end }}
 <!-- End of OpenIM Alert -->
 {{ end }}
 {{ end }}