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Structured Logs in .NET

with regular string interpolation, if you want to find all the logs where AccountId == 244 you have to hope the logs are in a very specific format and you need to search for ('accountid: 244', 'account id = 244', 'accountid = 244' etc...).

With structured logs it breaks out those variables into a structured system that recognizes those variables (like {AccountId}) and extracts them into an easily filterable format.

For example:

In the RCMBackgroundService there is a log: _logger.LogInformation("Excecuting {ClassName}", className);

You can find any log, logged with the Variable ClassName like this: 

traces
| where customDimensions.OriginalFormat == "{ClassName}"
And specific ones like this: 
traces
| where customDimensions.ClassName == "TaskUpdateNotificationService"