Grafana uses several types of variables.
|Query||Query-generated list of values such as metric names, server names, sensor IDs, data centers, and so on. Add a query variable.|
|Custom||Define the variable options manually using a comma-separated list. Add a custom variable.|
|Text box||Display a free text input field with an optional default value. Add a text box variable.|
|Constant||Define a hidden constant. Add a constant variable.|
|Data source||Quickly change the data source for an entire dashboard. Add a data source variable.|
|Interval||Interval variables represent time spans. Add an interval variable.|
|Ad hoc filters||Key/value filters that are automatically added to all metric queries for a data source (InfluxDB, Prometheus, and Elasticsearch only). Add ad hoc filters.|
|Global variables||Built-in variables that can be used in expressions in the query editor. Refer to Global variables.|
|Chained variables||Variable queries can contain other variables. Refer to Chained variables.|
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