Set Alert on System Metric
This Solution describes how to generate notifications based on server metrics, such as a full disk or overloaded CPU.
1. The Scalyr Agent should be installed on the server you want to monitor.
- In the navigation bar, click .
- Find the server in the list at the bottom of the page.
If the server is not listed:
- If you have not installed the agent on this server, follow the Agent Installation guide.
- If you have already installed the agent, consult the Agent Troubleshooting guide.
1. From the navigation bar, click, and select .
2. In the form near the top of the page, clickand select the hostname of the server you wish to monitor. (You should now see a set of graphs, showing system metrics for that server.)
3. Click on the graph showing the metric you'd like to alert on. You should be taken to a page showing a larger version of that graph.
4. Immediately below the graph is a list of metrics displayed in that graph. If you would like to alert based on the first metric listed, skip to step 5. Otherwise, you will need to edit the Expression box in the graph form, to specify the appropriate metric. Use the following chart:
|1-minute CPU load average||None|
|15-minute CPU load average||Change proc.loadavg.1min to proc.loadavg.15min|
|User CPU usage||None|
|System or iowait CPU usage||Change type='user' to type='system' or type='iowait'|
|Free space on root disk||None|
|Free space on other disk||Change mount='/' to mount='/mount-point-of-other-disk'|
|Inbound network bandwidth||None|
|Outbound network bandwidth||Change direction='in' to direction='out'|
|Average latency of disk reads||None|
|Average latency of disk writes||Change metric='iostat.part.msec_read' to metric='iostat.part.msec_write'|
5. Above the graph, clickand choose .
6. In the form that pops up, edit the first row to specify when the alert should trigger. When specifying the numeric value, be careful to use the units of the metric you're alerting on. For instance, to alert when there is less than 500MB of free disk space, say: "Alert when value is less than 500000" (since disk space is measured in KB). To alert if the CPU load average is above 10, say: "Alert when value is more than 10".
7. The other form fields are optional, but it's usually a good idea to enter a Description. Say something like "Server my-server-name: elevated CPU load".
8. Clickto create your alert.
To view all of your alerts, click Alerts Reference.in the navigation bar. From here, you can check alert status, edit, silence, and delete alerts. More information can be found in the
If you have many servers to monitor, you don't need to follow these steps for each server. Instead, you can create a templated alert that monitors all of your servers at once. See the Alert Templates section of the Alerts Reference.
By default, the alert will send a message to the e-mail address for your Scalyr account, but you can specify an alternate address such as your server ops team, a PagerDuty, OpsGenie, VictorOps, HipChat, or Slack account, or a webhook. You can also have the alert sent to multiple addresses. See Specifying Alert Recipients.