public void Log(LogLevel level, string message, params object[] formatItems)
{
Log(level, string.Format(message, formatItems);
}

I'd like to define my own attribute (much as NullableAttribute is supported) that specifies my method should receive the same analysis that string.Format() receives.

[StringFormatAnalysis]
public void Log(LogLevel level, string message, params object[] formatItems)
{
Log(level, string.Format(message, formatItems);
}

So calls like this would indicate warnings:

Log(LogLevel.Info, "Doing {0} {1} times", action);

Log(LogLevel.Info, "Entering {0}.", location, size);