style: add event for boot strap api #3120

Job	Run time
lint	1m 26s
lint	1m 26s
unit-test	3m 1s
unit-test	3m 1s
e2e-test (e2e/v2beta1/e2e_rebalance_test.go)	5m 12s
e2e-test (e2e/v2beta1/e2e_rebalance_test.go)	6m 8s
e2e-test (e2e/v2beta1/e2e_test.go)	8m 38s
e2e-test (e2e/v2beta1/e2e_test.go)	8m 38s
e2e-test (e2e/v1beta4/e2e_blure_green_upgrade_test.go)	5m 49s
e2e-test (e2e/v1beta4/e2e_blure_green_upgrade_test.go)	5m 49s
e2e-test (e2e/v1beta4/e2e_base_test.go)	11m 1s
e2e-test (e2e/v1beta4/e2e_base_test.go)	11m 1s
e2e-test (e2e/v1beta4/e2e_upgrade_test.go)	7m 29s
e2e-test (e2e/v1beta4/e2e_upgrade_test.go)	6m 23s
codecov	0s
codecov	5s
	1h 25m 7s

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