tree e541a388ca56c008e7245371188ca2d0ca6cf2b3
parent 7663baf7be94bee2742230cf04d94cb1fe2c565e
author Thomas Draebing <thomas.draebing@sap.com> 1588174422 +0200
committer Thomas Draebing <thomas.draebing@sap.com> 1589464535 +0200

Allow to monitor Gerrit on Kubernetes

So far it was only possible to monitor single instance Gerrit servers.
This was due to to the fact that a URL had to be used that pointed to
a dedicated instance, since if multiple replicas would be behind the
instance, the metrics of a random replica would be scraped and not of
all.

Prometheus has a service discovery functionality for deployments running
in Kubernetes. This is now used, when monitoring a Gerrit instance in
Kubernetes. This allows to have a variable number of replicas running,
which will be automatically discovered by Prometheus.

The dashboards were adapted accordingly and allow now to select the
replica to be observed. For now, no summary of all replicas can be
displayed in the dashboards, but that feature is planned to be added
in the future.

Change-Id: I96efc63a192cd90f5e3e91a53dace8e1ae83132e