BUG/MINOR: add last_chk in stats #532

Job	Run time
HAProxy check commit message	0s
generate-models	1m 14s
generate-specification	53s
Build	24s
go mod tidy	12s
golangci-lint	1m 33s
lint-spec	9s
Tests	35s
e2e on HAProxy (2.1)	40s
e2e on HAProxy (2.2)	43s
e2e on HAProxy (2.3)	43s
e2e on HAProxy (2.4)	42s
e2e on HAProxy (2.5)	42s
e2e on HAProxy (2.6)	38s
e2e on HAProxy (2.7)	38s
e2e on HAProxy (2.8)	39s
	10m 25s

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