`audit_runtime_facade_stops_empty_replay_workers` called the stop path and checked nothing, the same shape as the notify facade test in the previous commit. It now asserts the worker manager is empty afterwards and that a second call — which shutdown paths make — stays harmless.
The two heal timestamp tests bound their fields to `_`. Both timestamps come from `SystemTime::now().duration_since(UNIX_EPOCH).unwrap_or_default()`, so a pre-epoch clock yields 0; binding to `_` could not tell that apart from a real reading, which is precisely what the tests said they were guarding. They now require the value to be past 2020-01-01, and `last_update` not to predate `start_time`.
`test_config_parsing_with_multiple_instances` is left as it was — see the issue comment. Asserting on it turned up something bigger than a missing assertion.
Refs backlog#1836
fix(audit): propagate dispatch delivery failures instead of swallowing them (backlog#962)
AuditPipeline::dispatch and dispatch_batch accumulated per-target save()
errors, logged them, and then unconditionally returned Ok(()). When every
configured target failed the audit entry was lost outright (for store-backed
targets a failed save() means the event was neither delivered nor persisted
for replay), yet callers such as dispatch_audit_log saw success and assumed
the audit trail was intact. Audit is a compliance-critical path, so a total
delivery failure that reports success is a silent data-loss bug.
Both methods now distinguish three outcomes: all targets succeeded (Ok),
partial failure where at least one target accepted the event (log a warning
and return Ok, since the entry is not lost), and total failure where no
delivery succeeded while errors were recorded (record the failure metric,
log an error, and return Err(AuditError::Target) carrying the first target
error). This lets the caller react instead of assuming success.
Adds regression tests with a FailingTarget mock asserting that dispatch and
dispatch_batch return Err on total failure and Ok on partial failure.
Zhengchao An