vmarchaud opened a new issue #9904:
URL: https://github.com/apache/pulsar/issues/9904
**Describe the bug**
When trying to retrieve prometheus metrics from a broker, i get:
```
mars 13 09:32:26 pulsar-hosts-2 pulsar[15176]: 09:32:26.679
[pulsar-web-49-4] INFO org.eclipse.jetty.server.RequestLog - 127.0.0.1 - -
[13/Mar/2021:09:31:56 +0000] "GET /metrics/ HTTP/1.1" 500 553 "-" "curl/7.6
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: ... 11 more
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
org.apache.pulsar.broker.stats.prometheus.PrometheusMetricsGenerator.<clinit>(PrometheusMetricsGenerator.java:61)
~[org.apache.pulsar-pulsar-broker-2.7.0
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
io.prometheus.client.hotspot.DefaultExports.initialize(DefaultExports.java:23)
~[io.prometheus-simpleclient_hotspot-0.5.0.jar:?]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
io.prometheus.client.Collector.register(Collector.java:132)
~[io.prometheus-simpleclient-0.5.0.jar:?]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
io.prometheus.client.Collector.register(Collector.java:139)
~[io.prometheus-simpleclient-0.5.0.jar:?]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
io.prometheus.client.CollectorRegistry.register(CollectorRegistry.java:54)
~[io.prometheus-simpleclient-0.5.0.jar:?]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: Caused by:
java.lang.IllegalArgumentException: Collector already registered that provides
name: process_cpu_seconds_total
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.lang.Thread.run(Thread.java:748) [?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
[io.netty-netty-common-4.1.51.Final.jar:4.1.51.Final]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
[?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
[?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
[?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
[?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
[?:1.8.0_275]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36)
[org.apache.bookkeeper-bookkeeper-common-4.12.0.jar:4.12.0]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:32)
~[org.apache.pulsar-managed-ledger-2.7.0.jar:2.7.0]
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]: at
org.apache.pulsar.broker.stats.prometheus.PrometheusMetricsServlet.lambda$doGet$0(PrometheusMetricsServlet.java:70)
~[org.apache.pulsar-pulsar-broker-2.7
mars 13 09:31:56 pulsar-hosts-2 pulsar[15176]:
java.lang.ExceptionInInitializerError: null
```
**To Reproduce**
Steps to reproduce the behavior:
1. Launch broker, version 2.7.0
2. Run `curl localhost:8080/metrics/
4. See error
**Expected behavior**
Retrieve metrics for the broker in prometheus format
**Desktop (please complete the following information):**
- OS: Debian 10
- Broker Config: https://textbin.net/raw/v5zhwqjoim
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