tree 4adea62f69c7e6f03a5cc53a112f16057a53b38e
parent 86fc936e0c8f7e809846ff087a0d4e4057f71e48
author Scott Baker <smbaker@gmail.com> 1572389787 -0700
committer Scott Baker <smbaker@gmail.com> 1573143243 -0800

VOL-2098 Support for Kafka liveness testing

* Adds liveness channel to sarama_client and kafka_interadapter proxy.
The liveness channel will push true or false to the channel on
each successful or failed Kafka publish.

* Adds support to make a "liveness publish attempt", which publishes
an empty message on a _liveness channel.

* Adds ServiceStatusNotReady to Probe

* Suppresses multiple Probe.UpdateStatus of the same status

* Adds the ability to attach a Probe to the grpc server, so that
when the probe returns NotReady, the Server responds to requests
with UNAVAILABLE.

Change-Id: I996c719570a50f2f6f397887d10d489608269c3f