Global-warn

Emit a warn-level record through the shared default logger. This is the global convenience wrapper for log(Level::Warn, ...).

Interface

pub fn warn(message : String, fields~ : Array[Field] = []) -> Unit {}

input

• message : String - Warning message text.
• fields : Array[Field] - Optional structured fields attached to the record.

output

• Unit - No return value. The record is handled through the shared default logger.

Explanation

Detailed rules explaining key parameters and behaviors

• This helper delegates to default_logger().warn(...).
• Each call therefore reads the current shared default threshold and target at write time instead of holding one long-lived logger value internally.
• It uses the shared console sink and current default target.
• Warning logs are suited to degraded or suspicious states that do not necessarily stop execution.
• This helper offers convenience for a single shared logging path.

How to Use

Here are some specific examples provided.

When Need A Quick Global Warning

When a recoverable issue should be surfaced without creating a logger variable:

set_default_target("cache")
warn("cache miss ratio increased")

In this example, the shared default logger emits a warning-severity record under the cache target.

If set_default_target(...) or set_default_min_level(...) changes later, future warn(...) calls will observe those updated shared defaults automatically.

When Attach Structured Warning Context

When the warning should include machine-readable detail:

warn("retry scheduled", fields=[field("attempt", "3")])

In this example, the global helper still supports structured metadata.

Error Case

e.g.:

• If the shared minimum level is above Warn, the record is skipped.

• If subsystem-specific routing is needed, a shared global warning path may be too limited.

Notes

1. Global warnings are convenient for simple apps and scripts.

2. Future calls pick up later shared-default changes because the helper forwards through a fresh default_logger() each time.

3. Warning-level global events are often the first candidate for separate monitoring or routing later.