# What this PR does
This PR adds some enhancements to the `check_escalation_finished` celery
task. It short-circuits auditing of an alert group if it does not have
an escalation chain associated with it. In
`EscalationSnapshotMixin.start_escalation_if_needed`
we will not set `raw_escalation_snapshot`
([here](https://github.com/grafana/oncall/blob/dev/engine/apps/alerts/escalation_snapshot/escalation_snapshot_mixin.py#L262))
in this case:
```python3
def start_escalation_if_needed(self, countdown=START_ESCALATION_DELAY, eta=None):
"""
:type self:AlertGroup
"""
AlertGroup = apps.get_model("alerts", "AlertGroup")
is_on_maintenace_or_debug_mode = self.channel.maintenance_mode is not None
if (
self.is_restricted
or is_on_maintenace_or_debug_mode
or self.pause_escalation
or not self.escalation_chain_exists <-- here
):
logger.debug(
f"Not escalating alert group w/ pk: {self.pk}\n"
f"is_restricted: {self.is_restricted}\n"
f"is_on_maintenace_or_debug_mode: {is_on_maintenace_or_debug_mode}\n"
f"pause_escalation: {self.pause_escalation}\n"
f"escalation_chain_exists: {self.escalation_chain_exists}"
)
return
logger.debug(f"Start escalation for alert group with pk: {self.pk}")
# take raw escalation snapshot from db if escalation is paused
raw_escalation_snapshot = (
self.build_raw_escalation_snapshot() if not self.pause_escalation else self.raw_escalation_snapshot
)
task_id = celery_uuid()
AlertGroup.all_objects.filter(pk=self.pk,).update(
active_escalation_id=task_id,
is_escalation_finished=False,
raw_escalation_snapshot=raw_escalation_snapshot,
)
```
`EscalationSnapshotMixin.escalation_chain_exists` is as such:
```python3
@property
def escalation_chain_exists(self) -> bool:
if self.pause_escalation:
return False
elif not self.channel_filter:
return False
return self.channel_filter.escalation_chain is not None
```
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required) (N/A)
- [ ] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required) (N/A)
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