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Fix datasource selection
It appears that Grafana unconditionally replaces `${DS_PROMETHEUS}` in the JSON with the UID of the datasource selected in the dashboard import dialogue. I couldn’t find any way how to escape that (the usual suspects like `\$`, `\\$` and `$$` all don’t work). However, one can simply use another name and Grafana will keep the variable as is and thus selectable via the templating. This commit replaces any occurrence of `${DS_PROMETHEUS}` with `${datasource}` and further changes the templating to also use the variable name and the label to use capitalisation like the others already do. Closes: https://github.com/rfmoz/grafana-dashboards/issues/51 Closes: https://github.com/rfmoz/grafana-dashboards/issues/139 Signed-off-by: Christoph Anton Mitterer <mail@christoph.anton.mitterer.name>
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