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Many Grafana dashboards had their queries nuked. Currently display "no data".
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This happened at some point in the last 24 hours.

Some of the affected dashboards and panels I've spotted (I'm sure that there are many more):

When you edit any of these panels that states "no data", you find that the queries have been emptied (or can't load, who knows):

The history shows that they haven't been touched recently:

Event Timeline

Gilles created this task.Dec 3 2020, 8:05 AM
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Gilles triaged this task as Unbreak Now! priority.Dec 3 2020, 8:06 AM

Likely this is due to the default datasource changing from Graphite to Thanos in . I'll revert that change now.

Change 644970 had a related patch set uploaded (by Filippo Giunchedi; owner: Filippo Giunchedi):
[operations/puppet@production] Revert "grafana: set thanos as default datasource"

Change 644970 merged by Filippo Giunchedi:
[operations/puppet@production] Revert "grafana: set thanos as default datasource"

fgiunchedi closed this task as Resolved.Dec 3 2020, 8:50 AM
fgiunchedi claimed this task.

I've rolled back the change and we're back! Followup at T269333: Switch default Grafana datasource to Thanos