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### _Why are the changes needed?_
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Closes#951 from pan3793/license.
Closes#951
4629eecd [Cheng Pan] Fix
c45a0784 [Cheng Pan] nit
b9a46b42 [Cheng Pan] pin license header at first line
80d1a71b [Cheng Pan] nit
b2a46e4c [Cheng Pan] Update
f6acaaf8 [Cheng Pan] minor
ef99183f [Cheng Pan] Add license header on all docs
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
(cherry picked from commit a76c344042)
Signed-off-by: Cheng Pan <chengpan@apache.org>
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Support expose Prometheus metrics
### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible
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Closes#630 from pan3793/prometheus.
Closes#630
fff68b0 [Cheng Pan] nit
47c19eb [Cheng Pan] simplify
203e776 [Cheng Pan] address comments
10a877c [Cheng Pan] synchronized
26eb26e [Cheng Pan] simplify random port
827427c [Cheng Pan] fix import
476ee3a [Cheng Pan] address comments
9787c77 [Cheng Pan] update ut
c8e1b0e [Cheng Pan] update license
2387a97 [Cheng Pan] [METRICS] Support expose Prometheus metrics
Authored-by: Cheng Pan <379377944@qq.com>
Signed-off-by: Kent Yao <yao@apache.org>
