duplicated metrics collector

[tonicmuroq]

eru-agent[213677]: time="2021-04-07T09:50:33+08:00" level=info msg="[Watch] Monitor: cid f5b10cf action attach"
eru-agent[213677]: time="2021-04-07T09:50:33+08:00" level=info msg="[Watch] Monitor: cid f5b10cf action attach"
eru-agent[213677]: panic: duplicate metrics collector registration attempted
eru-agent[213677]: goroutine 91514882 [running]:
eru-agent[213677]: github.com/prometheus/client_golang/prometheus.(*Registry).MustRegister(0xc0001345f0, 0xc014c3c500, 0x13, 0x13)
eru-agent[213677]:         /home/runner/go/pkg/mod/github.com/prometheus/client_golang@v1.8.0/prometheus/registry.go:401 +0xad
eru-agent[213677]: github.com/prometheus/client_golang/prometheus.MustRegister(...)
eru-agent[213677]:         /home/runner/go/pkg/mod/github.com/prometheus/client_golang@v1.8.0/prometheus/registry.go:178
eru-agent[213677]: github.com/projecteru2/agent/engine.NewMetricsClient(0x0, 0x0, 0x7ffe6dbd2f7b, 0x6, 0xc03ff3c370, 0x1)
eru-agent[213677]:         /home/runner/work/agent/agent/engine/metrics.go:165 +0x210d
eru-agent[213677]: github.com/projecteru2/agent/engine.(*Engine).stat(0xc0001c86c0, 0x1401e00, 0xc054a310c0, 0xc03ff3c370)
eru-agent[213677]:         /home/runner/work/agent/agent/engine/stat.go:41 +0x2e5
eru-agent[213677]: created by github.com/projecteru2/agent/engine.(*Engine).attach
eru-agent[213677]:         /home/runner/work/agent/agent/engine/attach.go:65 +0x632
systemd[1]: eru-agent@210119.service: Main process exited, code=exited, status=2/INVALIDARGUMENT
systemd[1]: eru-agent@210119.service: Unit entered failed state.
systemd[1]: eru-agent@210119.service: Failed with result 'exit-code'.

[CMGS]

when & how