Singlevalue Grafana plugin

This plugin is similar to the singlestat plugin, with two differences:

• The value shown is a link, not just plain text.
• Otherwise, this plugin has fewer features and is simpler than singlestat.

Maintainers

Esteban Manchado Velázquez esteban@redhat.com (primary) and Nikolai Kondrashov nikolai.kondrashov@redhat.com (secondary).

Design principles

This plugin should be familiar to Grafana users (eg. it looks similar to Singlestat and supports a small subset of the ${__cell*} syntax in Table), but should be as simple as possible. Most of the code is in the SingleValueCtrl class in src/singlevalue_ctrl.js.

Development

To develop this plugin you need a Grafana installation. It's easy to get one with Docker. To make it easier to develop it is better if you use a Docker volume. You can do so by running the following commands:

docker volume create grafana-storage
docker run -d -p 127.0.0.1:3001:3000 -e GF_INSTALL_PLUGINS="<WHICHEVER_PLUGINS_YOU_NEED>" -v grafana-storage:/var/lib/grafana --name grafana grafana/grafana:6.6.0

Other plugins you might need to install are data sources, eg. doitintl-bigquery-datasource. The Docker volume files will be under /var/lib/docker/volumes/grafana-storage, so you can install the plugin code there and start developing.

How to test

Create a new dashboard and then a new panel. The panel should be a visualization, and the type should be "Singlevalue panel". Then input your query and set appropriate values for the "Text template" and "URL template" fields. Usually these will be static values, or the special macro ${__cell_XXX}, where XXX is the 0-based column index (only the first result of the query will be considered).

Short testing checklist:

• Go through every configuration value, changing it and checking that the changes produce the desired results.
• Check that leaving the URL empty will remove the link and leave the text.

Making a release

To make a new release, update the version field in plugin.json, tag the release, then upload a ZIP with the new release to GitLab.

To make a release ZIP file, type grunt zip. That will leave a file called grafana-singlevalue-panel-VERSION.zip in the current directory.