add doc for kafka checker

7 jobs for 14-kafkaChecker in 19 minutes and 29 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Lint
passed #15898980
lint:gofmt

00:01:33

passed #15898981
lint:vet

00:01:25

 
  Test
passed #15898983
test:coverage

00:02:05

58.5%
passed #15898982
test:unit

00:01:43

 
  Integration
passed #15898985
docker
integration:oneShot

00:15:50

passed #15898986
docker
integration:ramp

00:11:39

passed #15898987
docker
integration:repeat

00:11:55