Which notification is critical and falls under the Chief's no surprise rule?

The notification regarding a firefighter on duty injury is critical and falls under the Chief's no surprise rule because it directly impacts the safety of personnel and the operational effectiveness of the department. This rule emphasizes the importance of keeping leaders informed of significant incidents or situations that could affect the department or its members.

When a firefighter is injured while on duty, it can have serious implications for crew morale, operational readiness, and legal responsibility. Prompt communication about such injuries allows for immediate action regarding medical care, a review of safety protocols, and the assessment of potential hazards that may need to be addressed. This transparency is essential in maintaining trust and ensuring that the department is proactive in addressing risks and supporting its members.

The other options, while important in their own contexts, do not carry the same immediate urgency or implications for personnel safety and well-being as an injury on duty. Positive performance feedback, department maintenance issues, and training session changes may require communication but are typically not as critical as the circumstances surrounding an injury, which can necessitate urgent response and oversight.