This buyer’s guide explains why many organizations fail to get full value from SIEM, because SIEM is not “set and forget,” it needs ongoing expert tuning, log source prioritization, and continuous optimization to avoid data overload, high costs, and alert fatigue. It argues that pairing Managed SIEM with elevated MDR improves results by ensuring “SOC signal assurance” through SIEM coverage gap reporting and log health monitoring, including zero-log ingest alerts, then applying updated vendor rules plus custom detections and threat intelligence mapped to MITRE ATT&CK to turn logs into meaningful alerts. It emphasizes 24x7x365 human investigation, resolving every alert regardless of priority, contractual SLAs such as 10-minute critical notifications and a 60-minute-or-less median time to res

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