app-autoscaler-release Create liveliness endpoint

This change introduces new /health/liveness endpoint, allowing users to check the health of the individual services The response

{"overall_status":"UP","checks":[]}

Also, the following existing endpoints are now moved to the new paths

Golang Microservices

Exisiting Routes	New Health Routes
/	/health/prometheus
/debug/pprof	/health/debug/pprof
/debug/pprof	/health/debug/pprof
-	/health/liveness (new)
-	/health (respond to /health/liveness )

Scheduler Microservice

Exisiting Routes	New Health Routes
/health	/health/prometheus
/prometheus	/health/prometheus
-	/health/liveness (new)
-	/health (respond to /health/liveness )

By default, all health routes are protected with basic auth.

However, routes can be configured to be unprotected by using the configuration autoscaler.apiserver.health.unprotected_endpoints

Mar 02 '23 11:03 asalan316

The committers listed above are authorized under a signed CLA.

:white_check_mark: login: joergdw (75532c3b396f1538f7b99f9a2b114761c50a1f77, 00a13e4048238d75a0e16cdd40e10461f44d6b8f, e444bbce4665060e18a751b3a54a6d33e90e8f1c, b6a4f662f070ef9bea8a2206081c592a9bb8af4d, 92d47e1ed2bfa40545c0a771cb650018d4ed0275, d4cf916fade9efc856b9c0eda72a8aabbfe19747, 09d6dc51d4726a4030b6bbdf8604a54fc23534a8, d52d757f4d61382f74ac0723ac92f37e44800656, 55ac5e74e7a43ccc8861402a9d51275a36696227, 63410579e206bd573e02e309c705715cf678097b, fa43fcf75735d3ee9fbbf61a61de4413e7ce44c5, fdb2517b41799d37e4cfdc1349fee6d7b827ffee, 8e7895992291a19037170cb7adb459adc7933bbf)
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