/metrics return 404

[danghuagood]

1、Run druid-exporter-v0.8-linux-amd64 with following command :
druid-exporter --druid.uri="http://0.0.0.0" --port="10086"

2、Add the following configuration to druid(version:0.17.1) common.runtime.properties
druid.emitter=composing
druid.emitter.composing.emitters=["logging", "http"]
druid.emitter.logging.logLevel=info
druid.emitter.http.flushMillis=60000
druid.emitter.http.flushTimeOut=60000
druid.emitter.http.flushCount=500
druid.emitter.http.recipientBaseUrl=http://10.18.64.247:10086

druid send emitter successfully
2020-08-13T12:01:21,153 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.153Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"jvm/heapAlloc/bytes","value":574232}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/numEntries","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/sizeBytes","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/hits","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/misses","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/evictions","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/hitRate","value":0.0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/averageBytes","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/timeouts","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/errors","value":0}
2020-08-13T12:01:21,243 INFO [MonitorScheduler-0] org.apache.druid.java.util.emitter.core.LoggingEmitter - {"feed":"metrics","timestamp":"2020-08-13T04:01:21.243Z","service":"druid/historical","host":"10.10.18.102:8083","version":"0.17.1","metric":"query/cache/delta/put/ok","value":0}

3、Visit http://10.18.64.247:10086/metrics
HELP druid_health_status Health of Druid, 1 is healthy 0 is not
TYPE druid_health_status counter
druid_health_status{druid="health"} 0
HELP go_gc_duration_seconds A summary of the pause duration of garbage collection cycles.
TYPE go_gc_duration_seconds summary
go_gc_duration_seconds{quantile="0"} 0
go_gc_duration_seconds{quantile="0.25"} 0
go_gc_duration_seconds{quantile="0.5"} 0
go_gc_duration_seconds{quantile="0.75"} 0
go_gc_duration_seconds{quantile="1"} 0
go_gc_duration_seconds_sum 0
go_gc_duration_seconds_count 0
HELP go_goroutines Number of goroutines that currently exist.
TYPE go_goroutines gauge
go_goroutines 10
HELP go_info Information about the Go environment.
TYPE go_info gauge
go_info{version="go1.13"} 1
HELP go_memstats_alloc_bytes Number of bytes allocated and still in use.
TYPE go_memstats_alloc_bytes gauge
go_memstats_alloc_bytes 546144
HELP go_memstats_alloc_bytes_total Total number of bytes allocated, even if freed.
TYPE go_memstats_alloc_bytes_total counter
go_memstats_alloc_bytes_total 546144
HELP go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table.
TYPE go_memstats_buck_hash_sys_bytes gauge
go_memstats_buck_hash_sys_bytes 1.44308e+06
HELP go_memstats_frees_total Total number of frees.
TYPE go_memstats_frees_total counter
go_memstats_frees_total 160
HELP go_memstats_gc_cpu_fraction The fraction of this program's available CPU time used by the GC since the program started.
TYPE go_memstats_gc_cpu_fraction gauge
go_memstats_gc_cpu_fraction 0
HELP go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata.
TYPE go_memstats_gc_sys_bytes gauge
go_memstats_gc_sys_bytes 2.240512e+06
HELP go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use.
TYPE go_memstats_heap_alloc_bytes gauge
go_memstats_heap_alloc_bytes 546144
HELP go_memstats_heap_idle_bytes Number of heap bytes waiting to be used.
TYPE go_memstats_heap_idle_bytes gauge
go_memstats_heap_idle_bytes 6.5200128e+07
HELP go_memstats_heap_inuse_bytes Number of heap bytes that are in use.
TYPE go_memstats_heap_inuse_bytes gauge
go_memstats_heap_inuse_bytes 1.482752e+06
HELP go_memstats_heap_objects Number of allocated objects.
TYPE go_memstats_heap_objects gauge
go_memstats_heap_objects 2978
HELP go_memstats_heap_released_bytes Number of heap bytes released to OS.
TYPE go_memstats_heap_released_bytes gauge
go_memstats_heap_released_bytes 6.516736e+07
HELP go_memstats_heap_sys_bytes Number of heap bytes obtained from system.
TYPE go_memstats_heap_sys_bytes gauge
go_memstats_heap_sys_bytes 6.668288e+07
HELP go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection.
TYPE go_memstats_last_gc_time_seconds gauge
go_memstats_last_gc_time_seconds 0
HELP go_memstats_lookups_total Total number of pointer lookups.
TYPE go_memstats_lookups_total counter
go_memstats_lookups_total 0
HELP go_memstats_mallocs_total Total number of mallocs.
TYPE go_memstats_mallocs_total counter
go_memstats_mallocs_total 3138
HELP go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures.
TYPE go_memstats_mcache_inuse_bytes gauge
go_memstats_mcache_inuse_bytes 6944
HELP go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system.
TYPE go_memstats_mcache_sys_bytes gauge
go_memstats_mcache_sys_bytes 16384
HELP go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures.
TYPE go_memstats_mspan_inuse_bytes gauge
go_memstats_mspan_inuse_bytes 21624
HELP go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system.
TYPE go_memstats_mspan_sys_bytes gauge
go_memstats_mspan_sys_bytes 32768
HELP go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place.
TYPE go_memstats_next_gc_bytes gauge
go_memstats_next_gc_bytes 4.473924e+06
HELP go_memstats_other_sys_bytes Number of bytes used for other system allocations.
TYPE go_memstats_other_sys_bytes gauge
go_memstats_other_sys_bytes 789488
HELP go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator.
TYPE go_memstats_stack_inuse_bytes gauge
go_memstats_stack_inuse_bytes 425984
HELP go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator.
TYPE go_memstats_stack_sys_bytes gauge
go_memstats_stack_sys_bytes 425984
HELP go_memstats_sys_bytes Number of bytes obtained from system.
TYPE go_memstats_sys_bytes gauge
go_memstats_sys_bytes 7.1631096e+07
HELP go_threads Number of OS threads created.
TYPE go_threads gauge
go_threads 8
HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0
HELP process_max_fds Maximum number of open file descriptors.
TYPE process_max_fds gauge
process_max_fds 131072
HELP process_open_fds Number of open file descriptors.
TYPE process_open_fds gauge
process_open_fds 10
HELP process_resident_memory_bytes Resident memory size in bytes.
TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 9.396224e+06
HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
TYPE process_start_time_seconds gauge
process_start_time_seconds 1.59729039577e+09
HELP process_virtual_memory_bytes Virtual memory size in bytes.
TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 2.39341568e+08
HELP process_virtual_memory_max_bytes Maximum amount of virtual memory available in bytes.
TYPE process_virtual_memory_max_bytes gauge
process_virtual_memory_max_bytes -1
HELP promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
TYPE promhttp_metric_handler_requests_in_flight gauge
promhttp_metric_handler_requests_in_flight 1
HELP promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.
TYPE promhttp_metric_handler_requests_total counter
promhttp_metric_handler_requests_total{code="200"} 0
promhttp_metric_handler_requests_total{code="500"} 0
promhttp_metric_handler_requests_total{code="503"} 0

I can not see any druid_emitted_metrics and druid-exporter print 404