Improvement suggestion for `System Stats` dashboard.

[0xgouda]

Is your feature request related to a problem? Please describe.
The current System Stats displays cpu/memory/disk stats for the entire server, but only has the option to filter by dbname. This might not be practical for users with hundreds/thousands of unique dbnames, groups of whom share the same server.

Describe the solution you'd like
Given that tags is the potential way to identify different servers for different dbnames, It would be beneficial to introduce a new tag filter that limits the dbnames being shown, e.g., filter: host_tag=myhost

Describe alternatives you've considered
.

Additional context
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[0xgouda]

Additionally, I guess we should use the new Grafana tabs feature and move the System Stats time lag comparison dashboard under a separate tab in System Stats, and remove the old dashboard.

[pashagolub]

yes, but tabs are not yet officially launched AFAIK. They are experimental, no?

[pashagolub]

There is no host_tag in metrics at the moment

[pashagolub]

We, of course, may distinguish by tag_sys_id but I'm sure people would prefer human-readable "monitored source" rather then 64-bit integer.