tracing minimum version dependency

[cijothomas]

Opening an issue to continue the discussion in #2128 (comment)

[lalitb]

I think relatively easy non-breaking solution would be to remove use of name: metadata from the otel macros, and introduce them later.

macro_rules! otel_info {
    (name: $name:expr $(,)?) => {
        #[cfg(feature = "internal-logs")]
        {
            tracing::info!(  target: env!("CARGO_PKG_NAME"), name = $name, "");
        }
        #[cfg(not(feature = "internal-logs"))]
        {
            let _ = $name; // Compiler will optimize this out as it's unused.
        }
    };

[cijothomas]

but is there anything preventing us from requiring the minimum version of tracing that supports name?

[lalitb]

but is there anything preventing us from requiring the minimum version of tracing that supports name?

Yes I think this should be fine to go with. I don't see the users to have concerns in bumping their tracing version.