Adding a "restore defaults" button

This might be intended functionality, the view service will attempt to keep your configured period/grouping/resolution if possible when you switch between pages, and it doesn't make a distinction for the homepage. For example, if you explicitly ask for a 14 day period on the project page and then move to the homepage, it will consider your previously-configured 14-day period valid and use that instead of the default.

That's technically by design, but if its unexpected we can look into ways to change it? We could have the homepage forcefully reset everything on load (but this would break navigation), or maybe just add a "restore defaults" button to the dropdown?

As for things being removed from the URL... I think we have a few bugs in how we handle URL parameters, but the view service should always know about the proper values. If a parameter is missing or wrong, it's possible it didn't get updated even if the app processed the change correctly. What you see on the page (e.g. in the toolbar) should always be correct.

@Tim: Thanks for clarification. I think this has two things.

 1. adding a "restore defaults" button -- maybe a wishlist
 2. not syncing URL parameters -- maybe a bug

I'll change this to No.1 and file No.2 as a new bug.

I filed No.2 as a new bug
https://bugs.launchpad.net/openstack-health/+bug/1554441

This should be set as a 'wishlist', IMO.