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Upgrading docs: Add multi parent dependencies with changed reachability logic

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Michael Friedrich 2020-02-11 15:45:09 +01:00
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@ -10,6 +10,26 @@ follow the instructions for v2.7 too.
## Upgrading to v2.12 <a id="upgrading-to-2-12"></a>
### Behavior changes <a id="upgrading-to-2-12-behavior-changes"></a>
The behavior of multi parent [dependencies](03-monitoring-basics.md#dependencies) was fixed to e.g. render hosts unreachable when both router uplinks are down.
Previous behaviour:
1) parentHost1 DOWN, parentHost2 UP => childHost **not reachable**
2) parentHost1 DOWN, parentHost2 DOWN => childHost **not reachable**
New behavior:
1) parentHost1 DOWN, parentHost2 UP => childHost **reachable**
2) parentHost1 DOWN, parentHost2 DOWN => childHost **not reachable**
Please review your [Dependency](09-object-types.md#objecttype-dependency) configuration as 1) may lead to
different results for
- `last_reachable` via REST API query
- Notifications not suppressed by faulty reachability calculation anymore
### Breaking changes <a id="upgrading-to-2-12-breaking-changes"></a>
As of v2.12 our [API](12-icinga2-api.md) URL endpoint [`/v1/actions/acknowledge-problem`](12-icinga2-api.md#icinga2-api-actions-acknowledge-problem) refuses acknowledging an already acknowledged checkable by overwriting the acknowledgement.