Fix internal logging macros

[cijothomas]

Reverting #1973
Fixing the empty "" from our internal macros, that caused the message="user friendly message here" from being omitted in stdout!

Taking https://github.com/open-telemetry/otel-arrow/blob/main/rust/otap-dataflow/crates/controller/src/lib.rs#L668-L671 as example

otel_warn!(
                "core_affinity.set_failed",
                message = "Failed to set core affinity for pipeline thread. Performance may be less predictable."
            );

Before

2026-02-06T22:15:09.891Z  WARN  otap-df-controller::core_affinity.set_failed (crates/controller/src/lib.rs:668): 

(Missing message!)

After (i.e with this PR)

2026-02-06T22:11:19.095Z  WARN  otap-df-controller::core_affinity.set_failed (crates/controller/src/lib.rs:668): Failed to set core affinity for pipeline thread. Performance may be less predictable.

(Message is back)

"message" is already special cased in this repo, OTel Rust repo, and tracing itself. Passing user friendly string as an attribute named "message" is faster too!

Also, we avoid the less friendly syntax - #1981 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.76%. Comparing base (4f64cf4) to head (c9e50ed).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1985      +/-   ##
==========================================
- Coverage   85.77%   85.76%   -0.01%     
==========================================
  Files         513      513              
  Lines      162920   162908      -12     
==========================================
- Hits       139737   139723      -14     
- Misses      22649    22651       +2     
  Partials      534      534              

Components	Coverage Δ
otap-dataflow	87.58% <ø> (-0.01%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	90.23% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	53.50% <ø> (ø)
quiver	92.00% <ø> (ø)

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jmacd]

😞 sorry, Cijo, for my eager button-pressing in #1973.

[jmacd]

Munch-free? Thank you.

[cijothomas]

@jmacd @andborja I'll send a follow up to update the guidelines for Arrow contributors, so they know they can (and they should) use message="I love user friendly messages" whenever EventName is insufficient to express an event.

[andborja]

This is not adding the message as body. I still prefer as it was, as it did not restrict the usage of message as attribute (it is more flexible).

[cijothomas]

This is not adding the message as body. I still prefer as it was, as it did not restrict the usage of message as attribute (it is more flexible).

https://github.com/open-telemetry/otel-arrow/blob/main/rust/otap-dataflow/crates/telemetry/src/self_tracing/encoder.rs#L268-L269 "message" attribute becomes Body :)

[cijothomas]

@jmacd @andborja I'll send a follow up to update the guidelines for Arrow contributors, so they know they can (and they should) use message="I love user friendly messages" whenever EventName is insufficient to express an event.

#1987 Guidance proposal with CI enforcement.