docs: event filter page #7421

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 50s
sample_operators_tests (sample-operators/mysql-schema)	4m 3s
sample_operators_tests (sample-operators/webpage)	4m 0s
sample_operators_tests (sample-operators/operations)	10m 46s
sample_operators_tests (sample-operators/leader-election)	4m 37s
	27m 16s

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