timeseries: show spinner when tags load #5271
Merged
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When the initial tags are loading and when it is taking a long time,
users do not see anything for awhile. This can lead to a confusion and
lead people to believe that something in the plugin rendered
incorrectly.
Now, for the initial load only, this change shows spinner for the first
render.
This change had to change the data in MetricsReducers to remember the
last load time in addition to the DataLoadState so we can differentiate
first load vs. reload.