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Add CHILDREN to monitor scripts

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The CHILDREN parameter expands to a list of server IPs and ports that are
direct descendants of the server that initiated the event.

Also added a note that the variables can expand to empty strings if
nothing matches the criteria of the variable.
This commit is contained in:
Markus Mäkelä
2017-09-18 13:10:51 +03:00
parent 9080072de5
commit ab777c76c7
2 changed files with 38 additions and 0 deletions
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6
Documentation/Monitors/Monitor-Common.md
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@ -82,6 +82,12 @@ The following substitutions will be made to the parameter value:
* `$SYNCEDLIST` will be replaced with a list of server IPs and ports that are synced Galera nodes
* `$PARENT` will be replaced with the IP and port of the parent node of the server who initiated
the event. For master-slave setups, this will be the master if the initiating server is a slave.
* `$CHILDREN` will be replaced with the IPs and ports of the child nodes of the server who initiated
the event. For master-slave setups, this will be a list of slave servers if the initiating server is a master.
The expanded variable value can be an empty string if no servers match the
variable's requirements. For example, if no masters are available `$MASTERLIST`
will expand into an empty string.
For example, the previous example will be executed as: