It doesn't work if you put _logger.Information($"This is a {test}", "my input to logstash")? Looks like your are not putting the '$' in front of the string.

Have a look at the  docs

Hi Jeroen,

no, it doesn't work with the $ as well. Like I said, Epi loggerExtensions doesn't support that kind of message template. 

The message is a string, so it supports interpolated strings as well. I use them all the time

Hi Jeroen,

do you mean in EPI and with _logger.Information for example?

Because when I try this it for example: 

_logger.Information($"{Test}", "123");

it gives compilation error saying "Cannot resolve symbol Test".

My purpose here is to have events/fields/properties logged differently for visualization in Kibana.

Thanks for the help, I appreciate it. 

in this case {Test} should be a variable, or a property of an object you have, or ...  So you will probably get that compilation error because 'Test' is not available

An example from Quicksilver:

_logger.Information($"Cart '{cart.Name}' for user '{cart.CustomerId}' is being deleted.");

Yeah, but what I want is a placeholder, not a variable.

If you have time you can check "structured logging" or event logging. 

That's more or less what I'm talking about.

You could create your own enricher for the things you need, if that's an option

Sounds good. Do you have an example/link to share?

You could have a look at these

Sounds good. Will take a look. Thanks.

For sites that use Application Insights (whether Episerver DXC or not), here is an article with a small demonstration. It is about logging and tracing (metadata and metrics) with Application Insights.