March 2026 monthly summary for micrometer project. Key feature delivered: a Meter Registry Late Registration Warning to improve observability and correctness when a MeterRegistry is added after meters have already been registered. This helps users identify initialization order issues that could affect meter recordings and downstream metrics accuracy. The change uses a WarnThenDebugLogger pattern to emit a clear warning while avoiding log noise in normal operation. Major impact: Reduced risk of silent meter misreporting, faster issue diagnosis for users, and clearer guidance for proper initialization workflows. Aligns with reliability and observability goals and reduces support time spent on initialization issues. The work is small in scope but high-value in correctness and user guidance. Overall accomplishments: Delivered a lifecycle-aware warning that improves user experience and metric reliability; demonstrates disciplined logging strategy and collaboration to address user-impacting issues (see issue #7322). Technologies/skills demonstrated: Java-based metric instrumentation, advanced logging patterns (WarnThenDebugLogger), issue-tracking integration (#7322), code maintenance, and concise, user-focused documentation of behavior.