599166320 opened a new issue, #13285:
URL: https://github.com/apache/druid/issues/13285
### Affected Version
All druid versions have this problem.
### Description
The `identifier` may be used before it has time to assign a value, resulting
in null pointer exception.
The NullPointerException are as follows:
```
2022-10-29T06:06:38,547 ERROR [PrometheusPushGatewayEmitter-0]
org.apache.druid.emitter.prometheus.PrometheusEmitter - Unable to flush
prometheus metrics to pushGateway
java.lang.NullPointerException: null value in entry: druid=null
at
com.google.common.collect.CollectPreconditions.checkEntryNotNull(CollectPreconditions.java:33)
~[guava-16.0.1.jar:?]
at
com.google.common.collect.SingletonImmutableBiMap.<init>(SingletonImmutableBiMap.java:39)
~[guava-16.0.1.jar:?]
at
com.google.common.collect.ImmutableBiMap.of(ImmutableBiMap.java:57)
~[guava-16.0.1.jar:?]
at com.google.common.collect.ImmutableMap.of(ImmutableMap.java:80)
~[guava-16.0.1.jar:?]
at
org.apache.druid.emitter.prometheus.PrometheusEmitter.pushMetric(PrometheusEmitter.java:187)
~[?:?]
at
org.apache.druid.emitter.prometheus.PrometheusEmitter.flush(PrometheusEmitter.java:199)
~[?:?]
at
org.apache.druid.emitter.prometheus.PrometheusEmitter.lambda$start$0(PrometheusEmitter.java:102)
~[?:?]
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[?:1.8.0_301]
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
[?:1.8.0_301]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
[?:1.8.0_301]
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
[?:1.8.0_301]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_301]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_301]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_301]
```
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