Fix application crashing on startup

[feld]

Change description

If the folder UID changes for any reason prom_ex gets stuck in a crash loop that takes down the VM.

What problem does this solve?

Issue number: #176

None of the Grafana client functionality appears to have test coverage this time. edit: sorry, checked the wrong test modules

[akoutmos]

Thanks for the PR. Really appreciate it :). The Grafana Client functionality is validated in this test module https://github.com/akoutmos/prom_ex/blob/master/test/prom_ex/dashboard_uploader_test.exs using canned responses from Bypass. Could you add a test case in there to reproduce this?

[coveralls]

Coverage increased (+0.02%) to 79.022% when pulling 4bfd0cb on feld:master into 7a4dd91 on akoutmos:master.

[feld]

I tried to dig through the labyrinth of Grafana history and pinpoint exactly when they changed this but I can't figure out when that happened. I suspect you were testing against old Grafana API behavior.

I've changed the test that covers this scenario to mock the response code as a 409 instead of a 400 which does cause the test case to fail without the updated code.

[akoutmos]

Thanks! Appreciate you digging into Grafana source to see when this was change. To future proof it, definitely better that the match isn't limited to one specific status code and instead logs it out 👍 .