This datasource lets you to use the Alertmanager's API of Prometheus to create dashboards in Grafana.
The only two formats available are table and single.
Into the query expression field, you can set filters.
Examples:
alertname="HostDown"
will only display alerts which has the label alertname equals to "HostDown".severity="1"
will only display alerts which has the label severity equals to "1".
You can also set multiple parameters like alertname="DiskFull", df="opt"
.
You can display one label or more into the message field by setting labels name into the "Legend format" field.
Example:
{{msg}}
will display the content of the label "msg".Host: {{host}} / IP: {{ip}}
will display the following content: "Host: [host_value] / IP: [ip_value]"
To set labels in your alerts, you can follow the Prometheus's documentation: https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/.