RM UI2 and CM needs a health check url for ATSv2 service.
Create a /health rest endpoint
- must respond with 200 {health: ok} if all ok
- must respond with non 200 if any problem occurs
- could check reader/writer connection
- is depended upon by
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YARN-9543 [UI2] Handle ATSv2 server down or failures cases gracefully in YARN UI v2
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- Resolved
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