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When you encounter "404 Not Found", "424 Failed Dependency" and "502 Bad Gateway" tsdb errors in Grafana, this means that a Service died. In this documentation, I am using Zenoss as an example of service. So, "ServiceID" = Zenoss How can this issue be solved? 1. We need to clear the emergency-shutdown flags on Zenoss 2. Restart Zenoss The following steps will guide you through the process in solving this issue and what statuses should be checked: 1. Log in to the Control Center master host as root. i.e. root@mon1:~()# 2. Use this command to check the status of Zenoss: root@mon1:~()# serviced healthcheck All service status should be "passed". If status is "failed", this needs to clear the emergency flag. 3. Use this command to clear the emergency-shutdown flag for a service (Zenoss): root@mon1:~()# serviced service clear-emergency Zenoss Sample output: Cleared emergency status for 45 services 4. This command will check services...

Here's a sample process on how to create an alert on Grafana: 1. Go to your desired graph where you wanted to add an alert. 2. Click Edit 3. Go to the Alert tab. 4. Click " Create Alert " 5. In the " Alert Config " section, change the following values: a. Name - this will appear on the alert notification b. Evaluate every - change this to 5s. This means that the graph will update its data every 5 seconds. c. For - change this to 0m (zero minutes) 6. Under Conditions , set the following: a. When - click on "avg() to change to min(). There are also other options to choose from – depending on what you need. b. Of - change to query(A,1h,now) Query parameters: 1st parameter is the metric. 2nd parameter is the FROM value. 3rd parameter is the TO value. This is the condition being set to validate metrics data. c. Is Above - change this to " IS BELOW " and put the value " 0.01 ". There are a...