Reduce automatic check time from 15 to 45 seconds

Report https://gitlab.com/gitlab-com/operations/issues/42#note_3588320

It looks like a file called notes is loaded every ~15 seconds which checks for updates to content on the page. This may not cause a huge performance burden, but it's something simple that may be beneficial to change to ~45 second intervals, if it's even necessary at all. I currently have 5 GitLab tabs open, meaning that I'm polling the notes endpoint 20 times per minute. These things add up.

Sid: we will check anyway when the tab gets focus

/cc @dzaporozhets @JobV

mentioned in issue gitlab-com/operations#42 (closed)

We could increase the polling timeout over time (15, 30, 60, 120 seconds) and reset it to 15 seconds if the AJAX call returns new notes! :)

I think @rymai's solution would work well.

Good call @sytses. I think @rymai's proposal is good. We should cap it at 15 minutes or so.

mentioned in merge request !2821 (closed)

Reassigned to @alfredo1

We can also consider using exponential backoff, for example https://github.com/pawelpacana/exponential-backoff

mentioned in commit 0422ceff

mentioned in merge request !3070 (closed)

mentioned in merge request !3071 (merged)

mentioned in commit 3fbdca21

Status changed to closed by merge request !3071 (merged)

mentioned in commit f8c4dc97