Open health-checker module by default (#13490)

Author: wu-sheng

docs/en/changes/changes.md

@@ -95,6 +95,7 @@
 * Fix service_relation source layer in mq entry span analyse.
 * Fix metrics comparison in promql with bool modifier.
 * Add rate limiter for Zipkin trace receiver to limit maximum spans per second.
+* Open `health-checker` module by default due to latest UI changes. Change the default check period to 30s.
 
 #### UI
 

oap-server/server-starter/src/main/resources/application.yml

@@ -565,9 +565,9 @@ exporter:
     exportErrorStatusTraceOnly: ${SW_EXPORTER_KAFKA_TRACE_FILTER_ERROR:false}
 
 health-checker:
-  selector: ${SW_HEALTH_CHECKER:-}
+  selector: ${SW_HEALTH_CHECKER:default}
   default:
-    checkIntervalSeconds: ${SW_HEALTH_CHECKER_INTERVAL_SECONDS:5}
+    checkIntervalSeconds: ${SW_HEALTH_CHECKER_INTERVAL_SECONDS:30}
 
 status-query:
   selector: ${SW_STATUS_QUERY:default}