investigate/ adjust sentry logging

[danbjoseph]

as noted by @laurentS

Hi folks, just a quick note about the sentry notifications I'm seeing. There's an overwhelming number of "User matching query does not exist..." which I guess happens when people search for something that matches no username, which isn't really an error. I'd suggest disabling this pseudo error in sentry, for 2 reasons:
they drown out actual errors, which may not be taken care of because of the impression that they're rare,
senty has some rate limits, and all these bogus errors eat up your quotas, meaning you might actually miss real ones, particularly when the app/site are getting a peak of activity.