enable spring health checks

src/main/resources/application.properties

-

src/main/resources/application.yml

+
+management:
+  server:
+    port: 8081
+  health:
+    livenessState:
+      enabled: true
+    readinessState:
+      enabled: true
+  endpoint:
+    health:
+      group:
+        readiness:
+          include:
+          - readinessState
+          - mongo
+      probes.enabled: true
+    prometheus:
+      enabled: true
+  endpoints:
+    web:
+      exposure:
+        include: health,prometheus