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