panic: close of closed channel during "telemetry is stopping"

[dmachard]

Describe the bug

DNS collector is stopping and a second SIGTERM is received.

INFO: 2024/10/07 20:55:59.716423 main - telemetry is stopping
INFO: 2024/10/07 20:55:59.716495 worker - [sniffer] afpacket sniffer - stopping monitor...
INFO: 2024/10/07 20:55:59.716507 worker - [sniffer] afpacket sniffer - monitor terminated
INFO: 2024/10/07 20:55:59.716513 worker - [sniffer] afpacket sniffer - stopping collect...
INFO: 2024/10/07 20:55:59.716522 worker - [sniffer] afpacket sniffer - stop to listen...

^CINFO: 2024/10/07 20:56:00.368060 worker - [sniffer] afpacket sniffer - stopping sniffer...
INFO: 2024/10/07 20:56:00.371885 worker - [sniffer] dns processor - stopping monitor...
INFO: 2024/10/07 20:56:00.371913 worker - [sniffer] dns processor - monitor terminated
INFO: 2024/10/07 20:56:00.371923 worker - [sniffer] dns processor - stopping collect...
INFO: 2024/10/07 20:56:00.371931 worker - [sniffer] dns processor - collection terminated
INFO: 2024/10/07 20:56:00.371947 worker - [sniffer] afpacket sniffer - read data terminated
INFO: 2024/10/07 20:56:00.371959 worker - [sniffer] afpacket sniffer - collection terminated
INFO: 2024/10/07 20:56:00.371972 worker - [console] stdout - stopping monitor...
INFO: 2024/10/07 20:56:00.371980 worker - [console] stdout - monitor terminated
INFO: 2024/10/07 20:56:00.371992 worker - [console] stdout - stopping collect...
INFO: 2024/10/07 20:56:00.372003 worker - [console] stdout - logging terminated
INFO: 2024/10/07 20:56:00.372017 worker - [console] stdout - collection terminated
WARNING: 2024/10/07 20:56:00.372029 main - exiting...
INFO: 2024/10/07 20:56:00.372035 main - telemetry is stopping
INFO: 2024/10/07 20:56:00.372088 main - stopped
panic: close of closed channel

goroutine 24 [running]:
github.com/dmachard/go-dnscollector/telemetry.(*PrometheusCollector).Stop(...)
/home/denis/Lab/go-dnscollector/telemetry/prometheus.go:149
main.main.func1()
/home/denis/Lab/go-dnscollector/dnscollector.go:225 +0x354
created by main.main in goroutine 1
/home/denis/Lab/go-dnscollector/dnscollector.go:191 +0x9e5
exit status 2