This is the /var/log/messages when I restarted the service:
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[service]#011service/service.go:53#011Received sigterm/sigint, stopping
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011INFO#011cfgfile/reload.go:201#011Dynamic config reloader stopped
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011INFO#011[reload]#011cfgfile/list.go:118#011Stopping 3 runners ...
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[reload]#011cfgfile/list.go:129#011Stopping runner: system [metricsets=1]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:162#011client: closing acker
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:173#011client: done closing acker
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:176#011client: cancelled 0 events
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:147#011client: wait for acker to finish
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:149#011client: acker shut down
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=uptime, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[module]#011module/wrapper.go:148#011Stopped Wrapper[name=system, len(metricSetWrappers)=1]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[reload]#011cfgfile/list.go:131#011Stopped runner: system [metricsets=1]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[reload]#011cfgfile/list.go:129#011Stopping runner: system [metricsets=7]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:162#011client: closing acker
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:173#011client: done closing acker
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:176#011client: cancelled 0 events
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:147#011client: wait for acker to finish
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:149#011client: acker shut down
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=cpu, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[reload]#011cfgfile/list.go:129#011Stopping runner: system [metricsets=2]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:162#011client: closing acker
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:173#011client: done closing acker
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:176#011client: cancelled 0 events
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:147#011client: wait for acker to finish
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[publisher]#011pipeline/client.go:149#011client: acker shut down
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=filesystem, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=process, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.093-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=socket_summary, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=process_summary, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=load, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=memory, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=network, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:148#011Stopped Wrapper[name=system, len(metricSetWrappers)=7]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[reload]#011cfgfile/list.go:131#011Stopped runner: system [metricsets=7]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:207#011Stopped metricSetWrapper[module=system, name=fsstat, host=]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[module]#011module/wrapper.go:148#011Stopped Wrapper[name=system, len(metricSetWrappers)=2]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.094-0300#011DEBUG#011[reload]#011cfgfile/list.go:131#011Stopped runner: system [metricsets=2]
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.095-0300#011INFO#011[monitoring]#011log/log.go:153#011Total non-zero metrics#011{"monitoring": {"metrics": {"beat":{"cpu":{"system":{"ticks":210,"time":{"ms":215}},"total":{"ticks":420,"time":{"ms":434},"value":420},"user":{"ticks":210,"time":{"ms":219}}},"handles":{"limit":{"hard":4096,"soft":1024},"open":7},"info":{"ephemeral_id":"abb31563-06d9-46f7-9264-52fefa965640","uptime":{"ms":31101}},"memstats":{"gc_next":15844512,"memory_alloc":8696928,"memory_total":59818824,"rss":50475008},"runtime":{"goroutines":16}},"libbeat":{"config":{"module":{"running":0},"reloads":1,"scans":3},"output":{"events":{"acked":36,"batches":2,"total":36},"read":{"bytes":5899},"type":"elasticsearch","write":{"bytes":55779}},"pipeline":{"clients":0,"events":{"active":17,"published":53,"retry":20,"total":53},"queue":{"acked":36}}},"system":{"cpu":{"cores":2},"load":{"1":0.06,"15":0.05,"5":0.07,"norm":{"1":0.03,"15":0.025,"5":0.035}}}}}}
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.095-0300#011INFO#011[monitoring]#011log/log.go:154#011Uptime: 31.103070247s
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.095-0300#011INFO#011[monitoring]#011log/log.go:131#011Stopping metrics logging.
Apr 29 15:19:11 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:11.096-0300#011INFO#011instance/beat.go:445#011metricbeat stopped.
Apr 29 15:19:11 ip-10-0-0-116 auditbeat: 2020-04-29T15:19:11.657-0300#011WARN#011[process]#011process/process.go:274#011failed to hash executable /usr/share/metricbeat/bin/metricbeat for PID 17686: failed to hash file /usr/share/metricbeat/bin/metricbeat: hasher: file size 126513568 exceeds max file size
Apr 29 15:19:31 ip-10-0-0-116 metricbeat: 2020-04-29T15:19:31.211-0300#011DEBUG#011[cfgfile]#011cfgfile/reload.go:205#011Scan for new config files
After that, it started collecting events.
One thing that seems strange to me is that the /var/log/metricbeat/metricbeat don't show any log since Apr 22.