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Definition
/**
* Create a SeverityMapper for mapping Monolog levels to Telemetry severities.
*
* @param null|array<int, Severity> $customMapping Optional custom mapping (Monolog Level value => Telemetry Severity)
*
* Example with default mapping:
* ```php
* $mapper = severity_mapper();
* ```
*
* Example with custom mapping:
* ```php
* use Monolog\Level;
* use Flow\Telemetry\Logger\Severity;
*
* $mapper = severity_mapper([
* Level::Debug->value => Severity::DEBUG,
* Level::Info->value => Severity::INFO,
* Level::Notice->value => Severity::WARN, // Custom: NOTICE → WARN instead of INFO
* Level::Warning->value => Severity::WARN,
* Level::Error->value => Severity::ERROR,
* Level::Critical->value => Severity::FATAL,
* Level::Alert->value => Severity::FATAL,
* Level::Emergency->value => Severity::FATAL,
* ]);
* ```
*/
severity_mapper(?array $customMapping) : SeverityMapper
