hook error: "shortname of check must be specified"

https://review.opendev.org/#/c/669920/

Subscribed ~field-critical.

I'm facing this when deploying vault charm, revision 22. With charm revision 21, the issue does not occur.

tracer: ++ queue handler reactive/vault_handlers.py:377:start_vault
unit-vault-0: 17:15:50 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: reactive/vault_handlers.py:242:mysql_setup
unit-vault-0: 17:15:51 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: reactive/vault_handlers.py:271:database_not_ready
unit-vault-0: 17:15:51 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: reactive/vault_handlers.py:354:cluster_connected
unit-vault-0: 17:15:51 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: reactive/vault_handlers.py:492:send_vault_url_and_ca
unit-vault-0: 17:15:51 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: reactive/vault_handlers.py:508:prime_assess_status
unit-vault-0: 17:15:51 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: hooks/relations/vault-kv/provides.py:41:joined:secrets
unit-vault-0: 17:15:52 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: hooks/relations/tls-certificates/provides.py:57:broken:certificates
unit-vault-0: 17:15:52 INFO unit.vault/0.juju-log shared-db:327: Invoking reactive handler: reactive/vault_handlers.py:322:update_nagios
unit-vault-0: 17:15:52 INFO unit.vault/0.juju-log shared-db:327: Setting charm primary status True
unit-vault-0: 17:15:52 DEBUG unit.vault/0.juju-log shared-db:327: Changing permissions on existing content: 33261 -> 493
unit-vault-0: 17:15:52 ERROR unit.vault/0.juju-log shared-db:327: Hook error:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.6/site-packages/charms/reactive/__init__.py", line 73, in main
    bus.dispatch(restricted=restricted_mode)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.6/site-packages/charms/reactive/bus.py", line 390, in dispatch
    _invoke(other_handlers)
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.6/site-packages/charms/reactive/bus.py", line 359, in _invoke
    handler.invoke()
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.6/site-packages/charms/reactive/bus.py", line 181, in invoke
    self._action(*args)
  File "/var/lib/juju/agents/unit-vault-0/charm/reactive/vault_handlers.py", line 338, in update_nagios
    '/usr/lib/nagios/plugins/check_vault_version.py',
  File "/var/lib/juju/agents/unit-vault-0/.venv/lib/python3.6/site-packages/charmhelpers/contrib/charmsupport/nrpe.py", line 270, in add_check
    raise ValueError('shortname of check must be specified')
ValueError: shortname of check must be specified

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https://review.opendev.org/#/q/topic:bug/1835933+(status:open+OR+status:merged)