Github user yanghua commented on the issue:
https://github.com/apache/flink/pull/5936
cc @StephanEwen , here is the dependency tree :
```
[INFO] org.apache.flink:flink-metrics-prometheus:jar:1.6-SNAPSHOT
[INFO] +- io.prometheus:simpleclient:jar:0.3.0:compile
[INFO] \- io.prometheus:simpleclient_httpserver:jar:0.3.0:compile
[INFO] +- (io.prometheus:simpleclient:jar:0.3.0:compile - omitted for
duplicate)
[INFO] \- io.prometheus:simpleclient_common:jar:0.3.0:compile
[INFO] \- (io.prometheus:simpleclient:jar:0.3.0:compile - omitted for
duplicate)
```
---
