fix: modify the format of email alert (closes #477)

- Change the subject of the email sent
- Remove the unsubscribe line from the end of the email alert

chaos_genius/alerts/base_alerts.py

@@ -278,7 +278,7 @@ def send_alert_email(self, anomaly):
         recipient_emails = alert_channel_conf.get("email", [])
 
         if recipient_emails:
-            subject = f"KPI Alert Notification: [Alert Name - {self.alert_info['alert_name']}] [Alert ID - {self.alert_info['id']}]"
+            subject = f"{self.alert_info['alert_name']} - KPI Alert Notification - Chaos Genius"
             alert_message = self.alert_info["alert_message"]
             time_of_anomaly = str(getattr(anomaly, 'data_datetime'))
             highest_value = round(getattr(anomaly, 'y'), 1)

chaos_genius/alerts/email_templates/layout.html

@@ -150,8 +150,7 @@
                   style="font-family: sans-serif; vertical-align: top; padding-bottom: 10px; padding-top: 10px; font-size: 12px; color: #999999; text-align: center;">
                   <span class="apple-link" style="color: #999999; font-size: 12px; text-align: center;">Chaos Genius,
                     3260 Hillview Ave, Palo Alto, California 94304, US</span>
-                  <br> Don't like these emails? <a href="http://i.imgur.com/CScmqnj.gif"
-                    style="text-decoration: underline; color: #999999; font-size: 12px; text-align: center;">Unsubscribe</a>.
+                  <br>
                 </td>
               </tr>
             </table>