deprecate nagios monitor #10647

Job	Run time
setup-environment	49s
generate-metrics	4m 9s
coverage	7m 49s
gofmt	4m 34s
lint	13m 7s
test	14m 3s
tidy	1m 20s
cross-compile (binaries-darwin_amd64)	4m 35s
cross-compile (binaries-darwin_arm64)	4m 25s
cross-compile (binaries-linux_amd64)	4m 21s
cross-compile (binaries-linux_arm64)	4m 14s
cross-compile (binaries-windows_amd64)	4m 17s
cross-compile (binaries-linux_ppc64le)	4m 52s
	1h 12m 35s

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