Add all Go runtime metrics

[dongjiang1989]

expose all Go runtime metrics like GC stats, memory stats etc.

[oliver006]

Thanks for the PR!

Looking at the docs (and at the metrics that the exporter currently exports), I think thee two are already included in the default registry:

From:
https://github.com/prometheus/client_golang/blob/96a5ad6ef56e0d41d3bf06ba0478b34a0c718a92/prometheus/doc.go#L185-L188

// Also note that the DefaultRegisterer comes registered with a Collector for Go
// runtime metrics (via NewGoCollector) and a Collector for process metrics (via
// NewProcessCollector). With a custom registry, you are in control and decide
// yourself about the Collectors to register.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 80.68%. Comparing base (145ab23) to head (56a7cb7).

Files with missing lines	Patch %	Lines
main.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #997      +/-   ##
==========================================
- Coverage   80.82%   80.68%   -0.14%     
==========================================
  Files          19       19              
  Lines        2951     2956       +5     
==========================================
  Hits         2385     2385              
- Misses        456      461       +5     
  Partials      110      110              

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[coveralls]

Pull Request Test Coverage Report for Build 14639048560

Details

• 0 of 6 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 84.452%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
main.go	0	6	0.0%

Files with Coverage Reduction	New Missed Lines	%
main.go	1	0.0%

Totals
Change from base Build 14555681531:	-0.1%
Covered Lines:	2504
Relevant Lines:	2965

---

💛 - Coveralls

[dongjiang1989]

Looking at the docs (and at the metrics that the exporter currently exports), I think thee two are already included in the default registry:

Thanks @oliver006 review

Differences:

MustRegister(NewGoCollector())

change to

MustRegister(collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.MetricsAll)))

ref: https://github.com/prometheus/client_golang/blob/main/prometheus/registry.go#L60-L63

[oliver006]

MustRegister(collectors.NewGoCollector(collectors.WithGoCollectorRuntimeMetrics(collectors.MetricsAll)))

Thanks for highlighting the diff.

What does that effectively mean? What metrics are we getting with that ^^^ that we're currently missing out on.

On the one hand I like being explicit about initializing the Registry, on the other hand I like using the DefaultRegistry because it means I'm going with the defaults and if something new is added to the defaults then I'll automagically pull it in when upgrading the client_golang dependency.

Thoughts?