splunk 9 Splunk Defense Analyst Feb 9, 2026 Splunk Admin Feb 6, 2026 Data Normalization Feb 1, 2026 Splunk Certified Power User Jan 28, 2026 Splunk Core Certified User Jan 23, 2026 Detection Wizard Jul 31, 2025 Defensive Rules Apr 8, 2025 Splunk Cluster Administration: Learning the Platform at Scale Feb 13, 2025 HUNT-AI Nov 23, 2024