[7.x] Allow action types to perform their own mustache variable escaping in parameter templates (#83919)#85901
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pmuellr merged 2 commits intoelastic:7.xfrom Dec 15, 2020
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… parameter templates (elastic#83919) resolves elastic#79371 resolves elastic#62928 In this PR, we allow action types to determine how to escape the variables used in their parameters, when rendered as mustache templates. Prior to this, action parameters were recursively rendered as mustache templates using the default mustache templating, by the alerts library. The default mustache templating used html escaping. Action types opt-in to the new capability via a new optional method in the action type, `renderParameterTemplates()`. If not provided, the previous recursive rendering is done, but now with no escaping at all. For elastic#62928, changed the mustache template rendering to be replaced with the error message, if an error occurred, so at least you can now see that an error occurred. Useful to diagnose problems with invalid mustache templates.
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Backports the following commits to 7.x: