(Summer 2022)Feat add golang runtime metrics

[easonyipj]

• [ ] If this is non-trivial feature, paste the links/URLs to the design doc.
• [ ] Update the documentation to include this new feature.
• [ ] Tests(including UT, IT, E2E) are added to verify the new feature.
• [x] If it's UI related, attach the screenshots below.
• [ ] If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes #.
• [ ] Update the CHANGES log.

Feature Description

This feature is about the golang runtime metrics collcection, while using go2Sky gRPCReporter, it can collect golang runtime metrics automatically, and sending the metrics to OAP Server where you can monitor these metrics in general-Instance dashboard.

Supported metrics:

• instance_golang_heap_alloc bytes of allocated heap objects.
• instance_golang_stack_used bytes in stack spans.
• instance_golang_gc_count the gc count in one minute
• instance_golang_gc_pause_time the sum of all gc pause time in one minute
• instance_golang_live_goroutines_count the number of goroutines that currently exist.
• instance_golang_os_threads_count the number of records in the thread creation profile
• instance_host_cpu_used_rate the percentage of cpu used combined.
• instance_host_mem_used_rate the memory used rate

How it works

1. Using runtime.MemStats get golang runtime metrics, using shirou/gopsutil collect mem and cpu metrics
2. Using Meter API sending metrics to OAP Server
3. Add Meter Configuration files in OAP Server which defines the metrics name and collection way
4. Update the general-instance.json add some golang panels config

How to use

Just define the interval parameter function WithMeterCollectPeriod in NewGRPCReporter report, err := NewGRPCReporter("127.0.0.1:11800", WithMeterCollectPeriod(15*time.Second)) and default is 15 seconds

Example

[wu-sheng]

The doc should be updated to showing how to use meter APIs.

[easonyipj]

ok, i will add it

[codecov-commenter]

Codecov Report

Merging #168 (8d3b501) into master (91d0dd3) will decrease coverage by 5.18%. The diff coverage is 10.34%.

@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
- Coverage   64.85%   59.67%   -5.19%     
==========================================
  Files          22       23       +1     
  Lines        1104     1220     +116     
==========================================
+ Hits          716      728      +12     
- Misses        334      433      +99     
- Partials       54       59       +5     

Impacted Files	Coverage Δ
metrics.go	0.00% <0.00%> (ø)
reporter/grpc_opts.go	66.66% <0.00%> (-4.77%)	:arrow_down:
reporter/grpc.go	42.12% <16.43%> (-8.57%)	:arrow_down:

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