maoling commented on pull request #1528:
URL: https://github.com/apache/zookeeper/pull/1528#issuecomment-879870905
> I am not sure we have to write the version to Prometheus. why do you want
do to so ?
@eolivelli
- The version info is a valuable metric for users to diagnose/report issues
although we can find this from
other ways（e.g., log, JMX, zkServer.sh version）.
- A mature software should have this function in its metric system. Let me
give two example:
```
Example A:
JDK exposes its version metric like this:
jvm_info{version="1.8.0_191-b12",vendor="Oracle
Corporation",runtime="Java(TM) SE Runtime Environment",} 1.0
Example B:
Etcd exposes its version metric like this:
curl -L http://localhost:2379/metrics
# HELP etcd_server_version Which version is running. 1 for 'server_version'
label with current version.
# TYPE etcd_server_version gauge
etcd_server_version{server_version="3.3.13"} 1
```
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