hulucc opened a new issue, #9901:
URL: https://github.com/apache/cloudstack/issues/9901

   ISSUE TYPE
   
   Bug Report
   
   COMPONENT NAME
   
   Prometheus Exporter
   
   CLOUDSTACK VERSION
   
   4.18
   
   After the fix of #8024, get anothoer `NullPointerException` in prometheus 
exporter
   
   ```
   cloudstack-0 cloudstack WARN  [o.a.c.m.PrometheusExporterImpl] 
(HTTP-Dispatcher:null) (logid:) Getting metrics failed
   cloudstack-0 cloudstack java.lang.NullPointerException
   cloudstack-0 cloudstack         at 
org.apache.cloudstack.metrics.PrometheusExporterImpl.addHostMetrics(PrometheusExporterImpl.java:164)
   cloudstack-0 cloudstack         at 
org.apache.cloudstack.metrics.PrometheusExporterImpl.updateMetrics(PrometheusExporterImpl.java:458)
   cloudstack-0 cloudstack         at 
org.apache.cloudstack.metrics.PrometheusExporterServerImpl$ExporterHandler.handle(PrometheusExporterServerImpl.java:57)
   cloudstack-0 cloudstack         at 
jdk.httpserver/com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
   cloudstack-0 cloudstack         at 
jdk.httpserver/sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:82)
   cloudstack-0 cloudstack         at 
jdk.httpserver/com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:80)
   cloudstack-0 cloudstack         at 
jdk.httpserver/sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:848)
   cloudstack-0 cloudstack         at 
jdk.httpserver/com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77)
   cloudstack-0 cloudstack         at 
jdk.httpserver/sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:817)
   cloudstack-0 cloudstack         at 
jdk.httpserver/sun.net.httpserver.ServerImpl$DefaultExecutor.execute(ServerImpl.java:201)
   cloudstack-0 cloudstack         at 
jdk.httpserver/sun.net.httpserver.ServerImpl$Dispatcher.handle(ServerImpl.java:560)
   cloudstack-0 cloudstack         at 
jdk.httpserver/sun.net.httpserver.ServerImpl$Dispatcher.run(ServerImpl.java:526)
   cloudstack-0 cloudstack         at 
java.base/java.lang.Thread.run(Thread.java:829)
   ```


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