Write custom logs to a file on Orchestrator server

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How to write logs to a file and customize/filter information which will be written

Below are some steps that can be applied to write logs to a file, choose specific logs layout, and how to filter logs before writing:

  1. Write logs to a file
  • To write robot logs into a file on the Orchestrator server a new target needs to be added which will create a file on a daily basis with the short date as the filename:
  • Add a new Rule to send the logs to file:
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  1. Filtering the logs before writing them to file/Elasticsearch/other targets
There are some filters which can be applied to ignore logging specific messages/logs. Some examples :
<rules>
    <logger name="*" writeTo="file">
        <filters>
            <when condition="length('${message}') > 100" action="Ignore" />
            <when condition="equals('${logger}','MyApps.SomeClass')" action="Ignore" />
            <when condition="(level >= LogLevel.Debug and contains('${message}','PleaseDontLogThis')) or level==LogLevel.Warn" action="Ignore" />
            <when condition="not starts-with('${message}','PleaseLogThis')" action="Ignore" />
        </filters>
    </logger>
</rules>


All the filters can be found on the official Nlog Github repository


Below is an example of a filter that will not log messages bigger than 100 characters or logs that contain "Foo" string to the database target (if sensitive data is required to be filtered before sending)








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