Jake Landis 767f648f8e
Watcher add email warning if CSV attachment contains formulas (#44460) (#45557)
* Watcher add email warning if CSV attachment contains formulas (#44460)

This commit introduces a Warning message to the emails generated by 
Watcher's reporting action. This change complements Kibana's CSV 
formula notifications (see elastic/kibana#37930). 

This is implemented by reading a header (kbn-csv-contains-formulas) 
provided by Kibana to notify to attach the Warning to the email. 
The wording of the warning is borrowed from Kibana's UI and may 
be overridden by a dynamic setting
xpack.notification.reporting.warning.kbn-csv-contains-formulas.text.
This warning is enabled by default, but may be disabled via a 
dynamic setting xpack.notification.reporting.warning.enabled.
2019-08-26 08:35:33 -05:00
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