Grafana is a popular observability and monitoring application used to visualize data and help with time-series data analysis. It has an extensive ecosystem of widgets and plugins. QuestDB supports connecting to Grafana via the Postgres endpoint.
- Docker to run both Grafana and QuestDB
We will use the
--add-host parameter for both Grafana and QuestDB.
Start Grafana using
Once the Grafana server has started, you can access it via port 3000
http://localhost:3000). The default login credentials are as follows:
The Docker version for QuestDB can be run by exposing the port
8812 for the
PostgreSQL connection and port
9000 for the web and REST interface:
- Open Grafana's UI (by default available at
- Go to the
Configurationsection and click on
Add data source
- Choose the
PostgreSQLplugin and configure it with the following settings:
- When adding a panel, use the "text edit mode" by clicking the pencil icon and adding a query
Use global variables to simplify queries with dynamic elements such as date range filters.
This variable allows filtering results by sending a start-time and end-time to QuestDB. This expression evaluates to:
This variable calculates a dynamic interval based on the time range applied to the dashboard. By using this function, the sampling interval changes automatically as the user zooms in and out of the panel.
The visual query builder does not work with QuestDB. To work around this, use the text edit mode to write your queries.
This issue affects QuestDB version 7.3.0 and earlier. Starting from version 7.3.1, QuestDB accepts nanosecond precision timestamps. We are keeping this section for users who are using older versions of QuestDB.
For alert queries generated by certain Grafana versions, the macro
$__timeFilter(timestamp) produces timestamps with nanosecond precision, while
the expected precision is millisecond precision. As a result, the alert queries
are not compatible with QuestDB and lead to an
Invalid date error. To resolve
this, we recommend the following workaround:
See Grafana issues for more information.