Security Monitoring 2026

SIEM, EDR, SOAR. The 2026 stack.

SIEM at the centre

SIEM is the aggregation and detection layer. One searchable backend; continuous detection rules; aggressive cost discipline at ingest.

Aggregate security logs. Per-org one-backend rule; Splunk, Datadog Security, Elastic SIEM, Microsoft Sentinel.
Continuous detection rules. Per-rule always-on watch; failed-auth clusters, privilege escalations, unusual egress.
Cost discipline at ingest. Per-source security-relevant filter; ingest only what detection actually uses.
Per-rule named owner. Per-rule maintaining team; catches stale or noisy rules at the next rotation.

EDR is the endpoint-level visibility layer. Behavioural detection at the kernel; integrated with SIEM for correlation.

Vendor options. Per-org CrowdStrike, SentinelOne, Microsoft Defender choice; mature market with clear leaders.
Replaces signature-based antivirus. Per-fleet behavioural-detection upgrade; modern threats evade signature matches.
SIEM integration. Per-org endpoint-to-central feed; correlated with network and identity signals for context.
Per-fleet rollout discipline. Per-rollout staged deployment; catches agent-induced performance issues before they hit production.

SOAR orchestrates response across tools. Triage automation, playbooks, gradual expansion into containment actions.

Cross-tool orchestration. Per-incident multi-tool playbook execution; triage, investigation, contained actions.
Modern platforms. Per-org Tines, Torq, Splunk SOAR options; YAML-driven workflows beat click-built playbooks for review.
Low-risk first. Per-rollout enrichment-and-classification entry point; response actions follow once confidence builds.
Per-playbook named owner. Per-playbook maintaining team; the named owner keeps the automation current.

Operating the stack is its own discipline. Coverage model, tabletop exercises, red team validation.

24/7 SOC if scale supports. Per-org in-house SOC at scale; otherwise managed SOC service or rotation-based coverage.
Quarterly tabletop exercise. Per-quarter scenario walk-through; identifies monitoring gaps and closes them within the quarter.
Annual red team. Per-year adversarial exercise; tests what monitoring catches and what it misses under real attack technique.
Per-quarter detection-coverage map. Per-quarter named-vs-covered review; catches "we never detect X" gaps before an incident.