What is LoggerExtension Args Parameter and how to integrate with Application insights?

Question

I thought using args parameter i will see a new custom dimension under customDimensions in Azure Application insights but it is not working for me. I cannot find any good information about how to use this parameter. What is it for and where in App insights is the information can be found?

I simply passed an array of strings but no where this object can be found in AI.

//
        // Summary:
        //     Formats and writes an error log message.
        //
        // Parameters:
        //   logger:
        //     The Microsoft.Extensions.Logging.ILogger to write to.
        //
        //   exception:
        //     The exception to log.
        //
        //   message:
        //     Format string of the log message in message template format. Example:
        //     "User {User} logged in from {Address}"
        //
        //   args:
        //     An object array that contains zero or more objects to format.
        public static void LogError(this ILogger logger, Exception exception, string message, params object[] args)
        {
            logger.Log(LogLevel.Error, exception, message, args);
        }

Answer 1

I thought using args parameter i will see a new custom dimension under customDimensions in Azure Application insights

It does, but only if you supply a message template. For example, the following won't work:

logger.LogError(ex, "Error occured", "a", "simple", "string");

but this will:

logger.LogError(ex, "Error occured {PropA} {PropB} {PropC}", "a", "simple", "string");

The last line will result in three properties (named PropA, PropB and PropC) in the customDimensions field of the generated telemetry.