michaeljmarshall opened a new issue, #16587:
URL: https://github.com/apache/pulsar/issues/16587
**Describe the bug**
The `allocator-stats` for the broker's entry cache appear to be broken
because they are always 0, even when the cache is in use.
**To Reproduce**
Steps to reproduce the behavior:
1. Build apache/pulsar master.
2. Run `bin/pulsar standalone`
3. Run `bin/pulsar-perf consume -r 99 test`
4. Run `bin/pulsar-perf produce -r 100 test`
5. Run `bin/pulsar-admin broker-stats allocator-stats ml-cache` (I omitted
this result because it is too verbose. The allocations are zero every time
though and the result aligns with the prometheus metrics.)
6. You can also observe the broker's `allocations` related prometheus metrics
7. Note that while there is an active producer and consumer, I can see that
there are cache hits in the prometheus metrics.
**Expected behavior**
The broker cache metrics for allocations should produce the real cache size.
** Metrics**
Metrics containing `ml_cache`:
```
# TYPE pulsar_ml_cache_evictions gauge
pulsar_ml_cache_evictions{cluster="standalone"} 0 1657749677931
# TYPE pulsar_ml_cache_hits_rate gauge
pulsar_ml_cache_hits_rate{cluster="standalone"} 8.367224481632109
1657749677931
# TYPE pulsar_ml_cache_hits_throughput gauge
pulsar_ml_cache_hits_throughput{cluster="standalone"} 9056.903793586238
1657749677931
# TYPE pulsar_ml_cache_misses_rate gauge
pulsar_ml_cache_misses_rate{cluster="standalone"} 349.73998266551104
1657749677931
# TYPE pulsar_ml_cache_misses_throughput gauge
pulsar_ml_cache_misses_throughput{cluster="standalone"} 377094.08960597374
1657749677931
# TYPE pulsar_ml_cache_pool_active_allocations gauge
pulsar_ml_cache_pool_active_allocations{cluster="standalone"} 0 1657749677931
# TYPE pulsar_ml_cache_pool_active_allocations_huge gauge
pulsar_ml_cache_pool_active_allocations_huge{cluster="standalone"} 0
1657749677931
# TYPE pulsar_ml_cache_pool_active_allocations_normal gauge
pulsar_ml_cache_pool_active_allocations_normal{cluster="standalone"} 0
1657749677931
# TYPE pulsar_ml_cache_pool_active_allocations_small gauge
pulsar_ml_cache_pool_active_allocations_small{cluster="standalone"} 0
1657749677931
# TYPE pulsar_ml_cache_pool_allocated gauge
pulsar_ml_cache_pool_allocated{cluster="standalone"} 0 1657749677931
# TYPE pulsar_ml_cache_pool_used gauge
pulsar_ml_cache_pool_used{cluster="standalone"} 0 1657749677931
# TYPE pulsar_ml_cache_used_size gauge
pulsar_ml_cache_used_size{cluster="standalone"} 1077 1657749677931
```
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