support prometheus

[JoeCqupt]

Motivation:

885

Modification:

metrics support prometheus

Result:

Fixes #885

[OrezzerO]

Can we combine prometheus with grafana ? And provide a config for that . So that users can easily use sofarpc with prometheus.

Another question, how can we open or close this feature ?

[JoeCqupt]

Another question, how can we open or close this feature ?

        // use Prometheus-client defaultRegistry for example
        CollectorRegistry registry = CollectorRegistry.defaultRegistry;

        SofaRpcMetricsCollector collector = new SofaRpcMetricsCollector();

        // register collector  to open this feature
        registry.register(collector);

        // unregister collector to close this feature
        registry.unregister(collector);

[codecov[bot]]

Codecov Report

Merging #1280 (c91820f) into master (2a0556d) will increase coverage by 0.08%. The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1280      +/-   ##
============================================
+ Coverage     71.93%   72.02%   +0.08%     
- Complexity      780      783       +3     
============================================
  Files           413      414       +1     
  Lines         17555    17565      +10     
  Branches       2739     2740       +1     
============================================
+ Hits          12629    12652      +23     
+ Misses         3532     3521      -11     
+ Partials       1394     1392       -2     

Impacted Files	Coverage Δ
.../main/java/com/alipay/sofa/rpc/common/Version.java	100.00% <ø> (ø)
...ansport/bolt/ReuseBoltClientConnectionManager.java	69.56% <0.00%> (-2.90%)	:arrow_down:
...alipay/sofa/rpc/codec/protobuf/ProtobufHelper.java	77.08% <0.00%> (-2.09%)	:arrow_down:
...n/java/com/alipay/sofa/rpc/common/SofaConfigs.java	84.90% <0.00%> (-1.89%)	:arrow_down:
.../rpc/bootstrap/triple/TripleConsumerBootstrap.java	100.00% <0.00%> (ø)
...rpc/bootstrap/triple/TripleClientProxyInvoker.java	100.00% <0.00%> (ø)
...va/com/alipay/sofa/rpc/client/AbstractCluster.java	71.54% <0.00%> (+0.52%)	:arrow_up:
...ofa/rpc/tracer/sofatracer/TripleTracerAdapter.java	61.31% <0.00%> (+0.57%)	:arrow_up:
...pay/sofa/rpc/config/ConfigUniqueNameGenerator.java	94.44% <0.00%> (+0.69%)	:arrow_up:
...lipay/sofa/rpc/message/AbstractResponseFuture.java	57.01% <0.00%> (+0.87%)	:arrow_up:
... and 5 more

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