Creating Rules to Perform Actions on Messages
elmah.io comes with a great rule engine for performing various actions when messages are logged in your log.
This guide is also available as a short video tutorial here:
The rule engine is located beneath each log on the log settings page:
A rule consists of three parts: a title, a query, and an action.
The title should be a short text explaining what this rule does. We don't use the title for anything, so please write something that helps you identify rules and to keep them apart.
The query should contain either a full-text search string or a Lucene query. When new messages are logged, the message is matched up against all queries registered on that log. If and only if a message matches a query, the action registered on the rule is performed.
As mentioned above, the action part of a rule is executed when a message matches the query specified in the same rule. An action can be one of four types: Ignore, Hide, Mail, and HTTP Request. To illustrate how to use each action type, here are four examples of useful rules.
Ignore errors with an HTTP status code of 400
To ignore all messages with an HTTP status code of 400, you would need to set up the following:
| Title | Query | Then |
|---|---|---|
| Ignore 400s | statusCode:400 |
Ignore |
The rule would look like this in the UI:
Hide warnings
To hide all messages with a severity of Warning, you would need to set up the following:
| Title | Query | Then |
|---|---|---|
| Hide Warnings | severity:Warning |
Hide |
The rule would look like this in the UI:
Send an email on all messages containing a word
To send an email on all messages containing the word billing somewhere, you would need to set up the following:
| Title | Query | Then |
|---|---|---|
| Mail on billing | billing |
The rule would look like this in the UI:
Make an HTTP request on all new and fatal messages
To make an HTTP request on every new message with a severity of Fatal, you would need to set up the following:
| Title | Query | Then |
|---|---|---|
| Request on new fatal | isNew:true AND severity:Fatal |
HTTP |
The rule would look like this in the UI:
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