Notifications
Clear all
Topic starter
02/08/2026 11:50 am
TL;DR: Microsoft Sentinel’s value is often undermined by rapidly rising ingestion costs, noisy telemetry, and the engineering burden of routing non-Microsoft sources, according to DataBahn, with one enterprise reportedly saving $230,000 annually after filtering and dynamically routing security-relevant data. The real issue is that SIEM design choices now shape detection quality, operational efficiency, and what security teams can realistically retain and review.
NHIMG editorial — based on content published by DataBahn: Microsoft Sentinel best practices and cost optimisation for SOCs
By the numbers:
- DataBahn states that it has over 400 plug-and-play connectors for Sentinel deployments.
Questions worth separating out
Q: How should security teams decide which logs deserve SIEM ingestion in Microsoft Sentinel?
A: Start with investigative value, not source availability.
Q: Why do non-Microsoft sources make Sentinel harder to govern?
A: Because they usually require custom integration, ongoing parsing maintenance, and pipeline monitoring.
Q: What do teams get wrong about reducing SIEM costs?
A: They often try to cut cost after ingestion instead of deciding what should be ingested in the first place.
Practitioner guidance
- Define ingestion tiers by investigative value Classify telemetry into SIEM-critical, retention-only, and discardable categories before data reaches Sentinel.
- Map non-Microsoft log sources to engineering effort Inventory each external source that needs custom integration, then estimate the pipeline maintenance required to keep it stable over time.
- Preserve identity and privileged activity logs at full fidelity Keep authentication, service account, and privileged session events on the highest-quality path because they anchor investigations across cloud, endpoint, and application layers.
What's in the full article
DataBahn's full article covers the operational detail this post intentionally leaves for the source:
- How the Data Fabric approach classifies, suppresses, and routes logs before Sentinel ingestion
- The 400 plus connector context and the mechanics of handling third-party source pipelines
- The ADIF model’s split between critical SIEM events and lower-value long-term storage
- The UK enterprise consolidation example and the cost reduction result from implementation
👉 Read DataBahn's analysis of Microsoft Sentinel cost and performance optimisation →
Microsoft Sentinel ingestion sprawl: what IAM and SOC teams are missing?
Explore further
02/08/2026 12:59 pm
Telemetry overload is now a governance failure mode, not a tooling inconvenience. When SIEM intake outpaces classification, the organisation is effectively choosing between cost control and visibility without a clear policy for balancing both. That creates a hidden control gap because teams may preserve the logs that are easiest to ingest rather than the logs that matter most to investigations. The stronger model is deliberate retention by security value, not default full-fidelity collection.
A question worth separating out:
Q: Who is accountable when Sentinel routing choices cause missed detections?
A: Accountability usually sits with the team that owns log governance, not only the SOC. If critical telemetry is dropped, over-filtered, or routed to the wrong tier, the failure is architectural and operational. Security, cloud, and platform owners should jointly define what must stay visible, how long it must remain searchable, and which sources are exempt from aggressive reduction.
👉 Read our full editorial: Microsoft Sentinel data overload is a governance problem, not just a cost issue
