>
> This is important if you rely on the sysconfig configuration in your own scripts.
+### New Constants <a id="upgrading-to-2-10-path-new-constants"></a>
+
+New [Icinga constants](17-language-reference.md#icinga-constants) have been added in this release.
+
+* `ApiBindHost` and `ApiBindPort` to allow overriding the default ApiListener values. This will be used for an Icinga addon only.
+
## Upgrading to v2.9 <a id="upgrading-to-2-9"></a>
### Deprecation and Removal Notes <a id="upgrading-to-2-9-deprecation-removal-notes"></a>
NodeName |**Read-write.** Contains the cluster node name. Set to the local hostname by default.
RunAsUser |**Read-write.** Defines the user the Icinga 2 daemon is running as. Set in the Icinga 2 sysconfig.
RunAsGroup |**Read-write.** Defines the group the Icinga 2 daemon is running as. Set in the Icinga 2 sysconfig.
-MaxConcurrentChecks |**Read-write**. The number of max checks run simultaneously. Defaults to `512`.
-Environment |**Read-write**. The name of the Icinga environment. Included in the SNI host name when making outbound connections. Defaults to `production`.
+MaxConcurrentChecks |**Read-write.** The number of max checks run simultaneously. Defaults to `512`.
+Environment |**Read-write.** The name of the Icinga environment. Included in the SNI host name when making outbound connections. Defaults to `production`.
+ApiBindHost |**Read-write.** Overrides the default value for the ApiListener `bind_host` attribute. Not set by default.
+ApiBindPort |**Read-write.** Overrides the default value for the ApiListener `bind_port` attribute. Not set by default.
Application runtime details: