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dns-checker's Issues

the result metric should be inverted to have value 1 in case of an error and 0 on success

unify metric names

always use the same metric name but differ in the check-type label

runtime error on example config

Trying to follow the example config, always raises an error:

$ podman run  -p 2112:2112 -e TARGET=github.com  quay.io/bakito/dns-checker
time="2020-09-08T11:58:57Z" level=info msg=Starting interval=30s timeout=10s version=v3.0.0 workers=10
time="2020-09-08T11:58:57Z" level=info msg="Setup check" host=github.com
time="2020-09-08T11:58:57Z" level=info msg="Setup check" name=dns_checker_check
time="2020-09-08T11:58:57Z" level=info msg="Setup check" name=dns_checker_check
time="2020-09-08T11:58:57Z" level=info msg="Starting metrics" port=2112
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=1
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=2
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=3
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=4
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=5
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=6
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=7
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=8
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=9
time="2020-09-08T11:58:57Z" level=info msg="starting worker" worker=10
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x833000]

goroutine 55 [running]:
github.com/bakito/dns-checker/pkg/run.runCheck(0x9f0480, 0xc000294000, 0x6fc23ac00, 0xc000298000, 0xc000022027, 0xa, 0x0, 0x9ee840, 0xc000098570, 0x2)
	/build/pkg/run/execute.go:113 +0x120
github.com/bakito/dns-checker/pkg/run.(*worker).Start.func1(0xc00029c320)
	/build/pkg/run/pool.go:78 +0xca
created by github.com/bakito/dns-checker/pkg/run.(*worker).Start
	/build/pkg/run/pool.go:73 +0x3f