docs: event filter page #7419

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	4m 2s
sample_operators_tests (sample-operators/leader-election)	4m 19s
sample_operators_tests (sample-operators/webpage)	4m 26s
sample_operators_tests (sample-operators/mysql-schema)	3m 59s
sample_operators_tests (sample-operators/operations)	9m 20s
	26m 6s

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