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Docs: Add note for reachability calculation with checks disabled 

refs #6844
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Michael Friedrich 2019-05-08 17:31:36 +02:00
parent 736e0806d7
commit 15326caf38
1 changed files with 8 additions and 3 deletions
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11
doc/03-monitoring-basics.md
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@ -2383,14 +2383,19 @@ states = [ OK, Critical, Unknown ]
> If the parent service object changes into the `Warning` state, this
> dependency will fail and render all child objects (hosts or services) unreachable.
You can determine the child's reachability by querying the `is_reachable` attribute
in for example [DB IDO](24-appendix.md#schema-db-ido-extensions).
You can determine the child's reachability by querying the `last_reachable` attribute
via the [REST API](12-icinga2-api.md#icinga2-api).
> **Note**
>
> Reachability calculation depends on fresh and processed check results. If dependencies
> disable checks for child objects, this won't work reliably.
### Implicit Dependencies for Services on Host <a id="dependencies-implicit-host-service"></a>
Icinga 2 automatically adds an implicit dependency for services on their host. That way
service notifications are suppressed when a host is `DOWN` or `UNREACHABLE`. This dependency
does not overwrite other dependencies and implicitely sets `disable_notifications = true` and
does not overwrite other dependencies and implicitly sets `disable_notifications = true` and
`states = [ Up ]` for all service objects.
Service checks are still executed. If you want to prevent them from happening, you can