Use summary type to observe p99

[jyz0309]

Signed-off-by: jyz0309 45495947@qq.com

What this PR does:
Change metric type to observe RT P99 value.
Which issue(s) this PR fixes:
None.

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[codecov-commenter]

Codecov Report

Merging #1875 (88ee3c0) into 3.0 (759a9b5) will decrease coverage by 2.05%.
The diff coverage is 92.30%.

@@            Coverage Diff             @@
##              3.0    #1875      +/-   ##
==========================================
- Coverage   46.87%   44.82%   -2.06%     
==========================================
  Files         298      283      -15     
  Lines       17178    16933     -245     
==========================================
- Hits         8053     7591     -462     
- Misses       8272     8533     +261     
+ Partials      853      809      -44     

Impacted Files	Coverage Δ
metrics/prometheus/reporter.go	33.33% <91.66%> (+4.76%)	⬆️
config/metric_config.go	68.00% <100.00%> (+1.33%)	⬆️
registry/nacos/listener.go	0.00% <0.00%> (-80.87%)	⬇️
remoting/nacos/builder.go	0.00% <0.00%> (-73.92%)	⬇️
registry/etcdv3/registry.go	3.07% <0.00%> (-70.77%)	⬇️
metadata/report/etcd/report.go	1.11% <0.00%> (-61.12%)	⬇️
registry/etcdv3/listener.go	0.00% <0.00%> (-50.00%)	⬇️
config_center/nacos/listener.go	0.00% <0.00%> (-50.00%)	⬇️
remoting/etcdv3/listener.go	3.53% <0.00%> (-43.37%)	⬇️
config_center/nacos/impl.go	40.59% <0.00%> (-34.66%)	⬇️
... and 35 more

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[LaurenceLiZhixin]

Good， and it's better to add Max Age configuration at
https://github.com/apache/dubbo-go/pull/1875/files#diff-dabf5562f4d32b8bc69d22e50f651690c48257c90f56f7104cde9fc014af1cd3R217

The sdk:
https://github.com/prometheus/client_golang/blob/fa4aa9000d2863904891d193dea354d23f3d712a/prometheus/summary.go#L207

and export the configuration to dubbogo.yaml , metrics config struct of root config.

@jyz0309

[jyz0309]

Good， and it's better to add Max Age configuration at https://github.com/apache/dubbo-go/pull/1875/files#diff-dabf5562f4d32b8bc69d22e50f651690c48257c90f56f7104cde9fc014af1cd3R217

The sdk: https://github.com/prometheus/client_golang/blob/fa4aa9000d2863904891d193dea354d23f3d712a/prometheus/summary.go#L207

and export the configuration to dubbogo.yaml , metrics config struct of root config.

@jyz0309

Can you tell me how to export configuration to dubbogo.yaml? It will help a lot if there is a sample code. @LaurenceLiZhixin

[LaurenceLiZhixin]

Add a config field named "RTSummaryMaxAge" of metrics config here: https://github.com/apache/dubbo-go/blob/master/config/metric_config.go#L31
And set this config field to your summary.
@jyz0309