Bug 1889195 - Fix empty dashboards caused by upcasing msgId

[dmose]

See https://bugzilla.mozilla.org/show_bug.cgi?id=1889195 for details

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[dmose]

I'm changing this to a full-on PR, ready for review. Either before that review, or as part of it, we need to do the Bugzilla / github / searchfox archeology mentioned in https://bugzilla.mozilla.org/show_bug.cgi?id=1889195#c0 to be sure that we're not going to break anything here.

[dmose]

Move this back to draft - it fixes some dashboards while breaking others. Needs more investigation.

[dmose]

As an example, the dashboard for https://experimenter.services.mozilla.com/nimbus/np-survey-new-vs-existing-vs-returning-ru-zh-cn breaks.

I've figured out how to create a custom dimension of the lowercased message id, because I was hoping to do a case-insensitive compare on the Looker side. Unfortunately, such custom dimensions apparently can't be used as filters at the dashboard level itself.

One could imagine making the message-id field case-insensitive at the explore level, that probably requires more QA and discussions with Data folks, and might be the right way to go.

Perhaps there's another workaround, however.

[dmose]

I've just tested on main, and the dashboard mentioned in #135 (comment) has already been fixed. The other dashboards mentioned in the bug and currently not being shown will be reenabled by #432.