Benchmark dashboard

[eh-am]

Creates a benchmark dashboard based on the user facing one.
The only difference so far is an additional row at the top with benchmark metrics:

Plus updates examples/grafana-integration, although it's not currently functional, since it refers to the pyroscope:latest docker image, which doesn't contain the new metric names yet.

[petethepig]

@eh-am Looks good, I have 3 comments:

• Could you make the run progress be a gauge?
  
• what is pyroscope_benchmark metric? Second panel in the first row
• the first panel in the first raw was my hacky attempt at implementing the table you have in the second row. If it's not too hard it would be nice to just add all those things from the text panel to the table.

[codecov]

Codecov Report

Merging #349 (074e72c) into main (de87046) will not change coverage.
The diff coverage is n/a.

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  Coverage   54.32%   54.32%           
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  Files         102      102           
  Lines        5013     5013           
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  Hits         2723     2723           
  Misses       2041     2041           
  Partials      249      249           

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[eh-am]

Could you make the run progress be a gauge?

Done.

what is pyroscope_benchmark metric? Second panel in the first row

It's just an indication that the client has started, but yeah it's bit redundant given that we have the progress metric too. Removed it.

the first panel in the first raw was my hacky attempt at implementing the table you have in the second row. If it's not too hard it would be nice to just add all those things from the text panel to the table.

Ah it's not that hacky, I think it works pretty well. Honestly there are many columns which don't work well with an horizontal table, and having a vertical table seems non trivial (grafana/grafana#36973). So I left as it it's.

[petethepig]

LGTM