Set prometheus namespace to jitsi_jvb.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #2006 (ea5e5bd) into master (33ef732) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2006      +/-   ##
============================================
- Coverage     43.03%   42.98%   -0.05%     
+ Complexity     1677     1674       -3     
============================================
  Files           325      325              
  Lines         16888    16888              
  Branches       2227     2227              
============================================
- Hits           7267     7260       -7     
- Misses         8910     8916       +6     
- Partials        711      712       +1     

Impacted Files	Coverage Δ
...videobridge/metrics/VideobridgeMetricsContainer.kt	100.00% <100.00%> (ø)

... and 3 files with indirect coverage changes

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