Some older experiments show a 500 error code when trying to access their History page

[data-sync-user]

[Steps to reproduce]:

1. Navigate to this experiment page.
2. Click the History button and observe the behavior.

[Expected result]:

• The History page is loaded and all changes made on the experiment are displayed.

[Actual result]:

• A 500 server error is displayed.

[Notes]:

• There are a number of experiments currently in Stage which have this issue:
  • https://stage.experimenter.nonprod.dataops.mozgcp.net/nimbus/cfat-14/summary
  • https://stage.experimenter.nonprod.dataops.mozgcp.net/nimbus/cfat-15/summary
  • https://stage.experimenter.nonprod.dataops.mozgcp.net/nimbus/cfat-16/summary

┆Issue is synchronized with this Jira Bug

[jaredlockhart]

This is fixed in https://github.com/mozilla/experimenter/issues/9554

[SoftVision-CiprianMuresan]

For what it's worth, the experiments I linked still reproduce the issue and were not fixed by the change in https://github.com/mozilla/experimenter/issues/9554. Reopening at least for the Prod experiment.

We should fix that one at least with an admin edit if possible. But it's a bad look if an old experiment comes back into scope and its history page does not work.

[jaredlockhart]

Wait @SoftVision-CiprianMuresan which ones are still failing? The ones linked above all seem to be loading?

[SoftVision-CiprianMuresan]

All of them load yes and I can see the summary pages, but when I try to access the History page, that's where I still see the 500 error. Looks like backwards mentions don't work in JIRA, I had logged this as a follow-up to https://mozilla-hub.atlassian.net/browse/EXP-3906 which was partially fixed in https://github.com/mozilla/experimenter/pull/9547.

[jaredlockhart]

Oh sorry I was mireading I see, the history page, okay cool thank you I'll take a look 👍