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Docs: Add note for reachability calculation with checks disabled 

refs #6844

(cherry picked from commit 15326caf38)
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Michael Friedrich 2019-05-08 17:31:36 +02:00
parent 1d14b75fc1
commit 5f4f50b9af
1 changed files with 8 additions and 3 deletions
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doc/03-monitoring-basics.md
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@ -2424,14 +2424,19 @@ states = [ OK, Critical, Unknown ]
> If the parent service object changes into the `Warning` state, this > If the parent service object changes into the `Warning` state, this
> dependency will fail and render all child objects (hosts or services) unreachable. > 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 You can determine the child's reachability by querying the `last_reachable` attribute
in for example [DB IDO](24-appendix.md#schema-db-ido-extensions). 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> ### 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 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 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. `states = [ Up ]` for all service objects.
Service checks are still executed. If you want to prevent them from happening, you can Service checks are still executed. If you want to prevent them from happening, you can