[BUG] JVM metrics not shown in multibox grafana dashboard

[MFAshby]

Describe the bug

Severity

Steps to reproduce the behavior:

Install multibox and configure grafana integration
Create dashboard with export-dashboard RPC method, see https://docs.aidbox.app/multibox/multibox-monitoring

Expected behavior

JVM memory and JVM threads graphs should show some data.

Screenshots

JVM memory and JVM threads graphs show 'No data'

Versions:

• Aidbox image version:

:edge v:2209.1bf14e31

Additional context

The problem with the graph is that a box selector is applied to the jvm metrics like:
jvm_heap_memory{instance="sandbox"}, but in fact those metrics have no box selector since the JVM is shared between all boxes in the same instance.

Suggested fix; omit the instance=xyz filter on jvm metrics graphs. I'm currently working around by removing those selectors manually.