hangc0276 opened a new pull request, #3927:
URL: https://github.com/apache/bookkeeper/pull/3927
### Motivation
When we get the metrics output from Prometheus, we found the metrics
generated by the Prometheus client without type info, which will lead to some
monitor integration systems can't parse the metrics
```
jvm_gc_collection_seconds_count{gc="G1 Young Generation"} 4.0
jvm_gc_collection_seconds_sum{gc="G1 Young Generation"} 2.287
jvm_gc_collection_seconds_count{gc="G1 Old Generation"} 0.0
jvm_gc_collection_seconds_sum{gc="G1 Old Generation"} 0.0
jvm_memory_direct_bytes_max{} 2.147483648E9
jvm_threads_current{} 136.0
jvm_threads_daemon{} 18.0
jvm_threads_peak{} 137.0
jvm_threads_started_total{} 415.0
jvm_threads_deadlocked{} 0.0
jvm_threads_deadlocked_monitor{} 0.0
process_cpu_seconds_total{} 740.860392
process_start_time_seconds{} 1.681901598385E9
process_open_fds{} 484.0
process_max_fds{} 10240.0
log4j2_appender_total{level="debug"} 0.0
log4j2_appender_total{level="warn"} 20.0
log4j2_appender_total{level="trace"} 0.0
log4j2_appender_total{level="error"} 3.0
log4j2_appender_total{level="fatal"} 0.0
log4j2_appender_total{level="info"} 317.0
caffeine_cache_hit_total{cache="bookies-racks-exists"} 0.0
caffeine_cache_hit_total{cache="bookies-racks-children"} 0.0
caffeine_cache_hit_total{cache="bookies-racks-data"} 2.0
caffeine_cache_miss_total{cache="bookies-racks-exists"} 0.0
caffeine_cache_miss_total{cache="bookies-racks-children"} 0.0
caffeine_cache_miss_total{cache="bookies-racks-data"} 2.0
caffeine_cache_requests_total{cache="bookies-racks-exists"} 0.0
caffeine_cache_requests_total{cache="bookies-racks-children"} 0.0
caffeine_cache_requests_total{cache="bookies-racks-data"} 4.0
caffeine_cache_eviction_total{cache="bookies-racks-exists"} 0.0
caffeine_cache_eviction_total{cache="bookies-racks-children"} 0.0
```
### Changes
Write the metrics' type info to the output.
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