我们想在 Hono 上做一个性能测试来验证它是否支持 12000 个设备连接（MQTT），但是我在 grafana 的仪表板中找不到设备连接数。我还检查了 MQTT 适配器的 prometheus 数据端点，没有发现与连接数相关的指标。mqtt适配器的metrics如下
# HELP jvm_threads_live_threads The current number of live threads including both daemon and non-daemon threads
# TYPE jvm_threads_live_threads gauge
jvm_threads_live_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 30.0
# HELP hono_connections_authenticated
# TYPE hono_connections_authenticated gauge
hono_connections_authenticated{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",tenant="loadtest",} 0.0
# HELP logback_events_total Number of error level events that made it to the logs
# TYPE logback_events_total counter
logback_events_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",level="debug",} 813043.0
logback_events_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",level="info",} 1276.0
logback_events_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",level="trace",} 0.0
logback_events_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",level="warn",} 1.0
logback_events_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",level="error",} 8.0
# HELP jvm_memory_used_bytes The amount of used memory
# TYPE jvm_memory_used_bytes gauge
jvm_memory_used_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Tenured Gen",} 2.987608E7
jvm_memory_used_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'profiled nmethods'",} 1.6964352E7
jvm_memory_used_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Survivor Space",} 315472.0
jvm_memory_used_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Compressed Class Space",} 6350352.0
jvm_memory_used_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'non-profiled nmethods'",} 1.046592E7
jvm_memory_used_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'non-nmethods'",} 1260928.0
jvm_memory_used_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Metaspace",} 5.6632848E7
jvm_memory_used_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Eden Space",} 7935840.0
# HELP process_start_time_seconds Start time of the process since unix epoch.
# TYPE process_start_time_seconds gauge
process_start_time_seconds{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 1.591340143952E9
# HELP jvm_classes_loaded_classes The number of classes that are currently loaded in the Java virtual machine
# TYPE jvm_classes_loaded_classes gauge
jvm_classes_loaded_classes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 9043.0
# HELP jvm_threads_states_threads The current number of threads having NEW state
# TYPE jvm_threads_states_threads gauge
jvm_threads_states_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",state="timed-waiting",} 2.0
jvm_threads_states_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",state="terminated",} 0.0
jvm_threads_states_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",state="waiting",} 22.0
jvm_threads_states_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",state="blocked",} 0.0
jvm_threads_states_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",state="new",} 0.0
jvm_threads_states_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",state="runnable",} 6.0
# HELP jvm_buffer_memory_used_bytes An estimate of the memory that the Java virtual machine is using for this buffer pool
# TYPE jvm_buffer_memory_used_bytes gauge
jvm_buffer_memory_used_bytes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="mapped",} 0.0
jvm_buffer_memory_used_bytes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="direct",} 5.034343E7
# HELP process_files_open_files The open file descriptor count
# TYPE process_files_open_files gauge
process_files_open_files{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 32.0
# HELP process_files_max_files The maximum file descriptor count
# TYPE process_files_max_files gauge
process_files_max_files{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 1048576.0
# HELP jvm_gc_memory_allocated_bytes_total Incremented for an increase in the size of the young generation memory pool after one GC to before the next
# TYPE jvm_gc_memory_allocated_bytes_total counter
jvm_gc_memory_allocated_bytes_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 7.3979744768E10
# HELP jvm_threads_peak_threads The peak live thread count since the Java virtual machine started or peak was reset
# TYPE jvm_threads_peak_threads gauge
jvm_threads_peak_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 30.0
# HELP hono_connections_unauthenticated
# TYPE hono_connections_unauthenticated gauge
hono_connections_unauthenticated{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.0
# HELP jvm_gc_memory_promoted_bytes_total Count of positive increases in the size of the old generation memory pool before GC to after GC
# TYPE jvm_gc_memory_promoted_bytes_total counter
jvm_gc_memory_promoted_bytes_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 2.1365048E8
# HELP jvm_buffer_count_buffers An estimate of the number of buffers in the pool
# TYPE jvm_buffer_count_buffers gauge
jvm_buffer_count_buffers{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="mapped",} 0.0
jvm_buffer_count_buffers{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="direct",} 9.0
# HELP hono_connections_authenticated_duration_seconds_max
# TYPE hono_connections_authenticated_duration_seconds_max gauge
hono_connections_authenticated_duration_seconds_max{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",tenant="loadtest",} 20.0
# HELP hono_connections_authenticated_duration_seconds
# TYPE hono_connections_authenticated_duration_seconds summary
hono_connections_authenticated_duration_seconds_count{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",tenant="loadtest",} 39.0
hono_connections_authenticated_duration_seconds_sum{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",tenant="loadtest",} 554.666
# HELP jvm_gc_pause_seconds Time spent in GC pause
# TYPE jvm_gc_pause_seconds summary
jvm_gc_pause_seconds_count{action="end of minor GC",cause="GCLocker Initiated GC",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 1.0
jvm_gc_pause_seconds_sum{action="end of minor GC",cause="GCLocker Initiated GC",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.077
jvm_gc_pause_seconds_count{action="end of major GC",cause="Allocation Failure",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 12.0
jvm_gc_pause_seconds_sum{action="end of major GC",cause="Allocation Failure",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 2.14
jvm_gc_pause_seconds_count{action="end of minor GC",cause="Allocation Failure",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 4483.0
jvm_gc_pause_seconds_sum{action="end of minor GC",cause="Allocation Failure",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 6.652
jvm_gc_pause_seconds_count{action="end of major GC",cause="Metadata GC Threshold",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 1.0
jvm_gc_pause_seconds_sum{action="end of major GC",cause="Metadata GC Threshold",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.12
# HELP jvm_gc_pause_seconds_max Time spent in GC pause
# TYPE jvm_gc_pause_seconds_max gauge
jvm_gc_pause_seconds_max{action="end of minor GC",cause="GCLocker Initiated GC",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.0
jvm_gc_pause_seconds_max{action="end of major GC",cause="Allocation Failure",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.0
jvm_gc_pause_seconds_max{action="end of minor GC",cause="Allocation Failure",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.002
jvm_gc_pause_seconds_max{action="end of major GC",cause="Metadata GC Threshold",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.0
# HELP process_uptime_seconds The uptime of the Java virtual machine
# TYPE process_uptime_seconds gauge
process_uptime_seconds{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 345543.191
# HELP process_cpu_usage The "recent cpu usage" for the Java Virtual Machine process
# TYPE process_cpu_usage gauge
process_cpu_usage{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 6.546644844517185E-4
# HELP jvm_memory_committed_bytes The amount of memory in bytes that is committed for the Java virtual machine to use
# TYPE jvm_memory_committed_bytes gauge
jvm_memory_committed_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Tenured Gen",} 4.8328704E7
jvm_memory_committed_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'profiled nmethods'",} 1.7891328E7
jvm_memory_committed_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Survivor Space",} 2424832.0
jvm_memory_committed_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Compressed Class Space",} 7077888.0
jvm_memory_committed_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'non-profiled nmethods'",} 1.0747904E7
jvm_memory_committed_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'non-nmethods'",} 2555904.0
jvm_memory_committed_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Metaspace",} 5.8368E7
jvm_memory_committed_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Eden Space",} 1.9464192E7
# HELP system_cpu_usage The "recent cpu usage" for the whole system
# TYPE system_cpu_usage gauge
system_cpu_usage{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.036333878887070375
# HELP jvm_gc_live_data_size_bytes Size of old generation memory pool after a full GC
# TYPE jvm_gc_live_data_size_bytes gauge
jvm_gc_live_data_size_bytes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 2.7826992E7
# HELP system_load_average_1m The sum of the number of runnable entities queued to available processors and the number of runnable entities running on the available processors averaged over a period of time
# TYPE system_load_average_1m gauge
system_load_average_1m{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 0.93
# HELP jvm_classes_unloaded_classes_total The total number of classes unloaded since the Java virtual machine has started execution
# TYPE jvm_classes_unloaded_classes_total counter
jvm_classes_unloaded_classes_total{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 197.0
# HELP jvm_gc_max_data_size_bytes Max size of old generation memory pool
# TYPE jvm_gc_max_data_size_bytes gauge
jvm_gc_max_data_size_bytes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 1.146486784E9
# HELP jvm_memory_max_bytes The maximum amount of memory in bytes that can be used for memory management
# TYPE jvm_memory_max_bytes gauge
jvm_memory_max_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Tenured Gen",} 1.146486784E9
jvm_memory_max_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'profiled nmethods'",} 1.22912768E8
jvm_memory_max_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Survivor Space",} 5.7278464E7
jvm_memory_max_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Compressed Class Space",} 1.073741824E9
jvm_memory_max_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'non-profiled nmethods'",} 1.22916864E8
jvm_memory_max_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="CodeHeap 'non-nmethods'",} 5828608.0
jvm_memory_max_bytes{area="nonheap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Metaspace",} -1.0
jvm_memory_max_bytes{area="heap",component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="Eden Space",} 4.58620928E8
# HELP jvm_threads_daemon_threads The current number of live daemon threads
# TYPE jvm_threads_daemon_threads gauge
jvm_threads_daemon_threads{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 6.0
# HELP system_cpu_count The number of processors available to the Java virtual machine
# TYPE system_cpu_count gauge
system_cpu_count{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",} 1.0
# HELP jvm_buffer_total_capacity_bytes An estimate of the total capacity of the buffers in this pool
# TYPE jvm_buffer_total_capacity_bytes gauge
jvm_buffer_total_capacity_bytes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="mapped",} 0.0
jvm_buffer_total_capacity_bytes{component_name="hono-mqtt",component_type="adapter",host="hono-poc-adapter-mqtt-vertx-6db45b86f6-wqpbm",id="direct",} 5.0343429E7
- 我应该如何知道 MQTT 适配器连接了多少台设备？
- 一般来说，一个 1c2G MQTT POD 可以支持多少个连接？