Comment 1 for bug 1991558

I'm also seeing the same symptom but with a different traceback in https://solutions.qa.canonical.com/v2/testruns/161701b7-1956-4bdd-9a38-8930d98a7c76

```
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/./src/charm.py", line 153, in <module>
    main(OpenstackLoadbalancerCharm)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/main.py", line 431, in main
    _emit_charm_event(charm, dispatcher.event_name)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/main.py", line 142, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/framework.py", line 283, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/framework.py", line 743, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/framework.py", line 790, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/interface_openstack_loadbalancer/loadbalancer.py", line 213, in _on_relation_changed
    self.on.lb_requested.emit()
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/framework.py", line 283, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/framework.py", line 743, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/ops/framework.py", line 790, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/./src/charm.py", line 149, in _process_lb_requests
    self._configure_haproxy()
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/./src/charm.py", line 146, in _configure_haproxy
    _render_configs()
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/charmhelpers/core/host.py", line 778, in wrapped_f
    return restart_on_change_helper(
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/charmhelpers/core/host.py", line 864, in restart_on_change_helper
    _post_restart_on_change_helper(checksums,
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/venv/charmhelpers/core/host.py", line 934, in _post_restart_on_change_helper
    restart_functions[service_name](service_name)
  File "/var/lib/juju/agents/unit-ceph-dashboard-loadbalancer-0/charm/./src/charm.py", line 33, in reload_service
    subprocess.check_call(['systemctl', 'reload', service_name])
  File "/usr/lib/python3.10/subprocess.py", line 369, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['systemctl', 'reload', 'haproxy']' returned non-zero exit status 1.
```