Feb  5 12:41:48 |DEBU| some message 1 rand_index=1 caller=zapper/zapper.go:18
Feb  5 12:41:49 |ERRO| some message 2 rand_index=3 caller=zapper/zapper.go:18
Feb  5 15:45:04 |FATA| some message 5 rand_index=11 caller=zapper/zapper.go:18
Feb  5 12:41:50 |INFO| some message 3 rand_index=5 caller=zapper/zapper.go:18
Feb  5 12:41:51 |WARN| some message 4 rand_index=7 caller=zapper/zapper.go:18
2021-02-06T22:55:22.004Z	DEBUG	zapper/zapper.go:17	some message 1	{"rand_index": 1}
2021-02-06T22:55:22.008Z	ERROR	zapper/zapper.go:17	some message 2	{"rand_index": 2}
2021-02-06T22:55:22.009Z	FATAL	zapper/zapper.go:17	some message 5	{"rand_index": 1}
2021-02-06T22:55:22.009Z	INFO	zapper/zapper.go:17	some message 3	{"rand_index": 2}
2021-02-06T22:55:22.009Z	WARN	zapper/zapper.go:17	some message 4	{"rand_index": 4}
