Comment 0 for bug 1971063

The relation between mattermost-k8s postgressql-k8s returns this error:

kubernetes.config.config_exception.ConfigException: Service host/port is not set.
unit-postgresql-k8s-0: 22:44:43 ERROR juju.worker.uniter.operation hook "db-relation-changed" (via hook dispatching script: dispatch) failed: exit status 1
unit-postgresql-k8s-0: 22:44:43 INFO juju.worker.uniter awaiting error resolution for "relation-changed" hook
unit-postgresql-k8s-0: 22:45:03 INFO juju.worker.uniter awaiting error resolution for "relation-changed" hook
unit-postgresql-k8s-0: 22:45:04 ERROR unit.postgresql-k8s/0.juju-log db:2: Uncaught exception while in charm code:
Traceback (most recent call last):
  File "./src/charm.py", line 235, in <module>
    ops.main.main(PostgreSQLCharm, use_juju_for_storage=True)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/ops/main.py", line 402, in main
    _emit_charm_event(charm, dispatcher.event_name)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/ops/main.py", line 140, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/ops/framework.py", line 278, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/ops/framework.py", line 722, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/ops/framework.py", line 767, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/src/clientrel.py", line 105, in on_db_relation_changed
    master_ip = self.master_service_ip
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/src/clientrel.py", line 75, in master_service_ip
    svc = self.get_k8s_service(self.master_service_name)
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/src/clientrel.py", line 88, in get_k8s_service
    self.k8s_auth()
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/src/clientrel.py", line 62, in k8s_auth
    kubernetes.config.load_incluster_config()
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/kubernetes/config/incluster_config.py", line 118, in load_incluster_config
    InClusterConfigLoader(
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/kubernetes/config/incluster_config.py", line 54, in load_and_set
    self._load_config()
  File "/var/lib/juju/agents/unit-postgresql-k8s-0/charm/venv/kubernetes/config/incluster_config.py", line 62, in _load_config
    raise ConfigException("Service host/port is not set.")