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02/08/2026 11:50 am
TL;DR: SIEM bills rise when organisations pay premium ingestion costs for low-value telemetry, while pre-ingestion filtering and enrichment can cut SIEM-bound volume by 50 to 70 percent, according to DataBahn's analysis. The governance issue is no longer whether to collect less, but how to route, enrich, and retain logs without creating blind spots.
NHIMG editorial — based on content published by DataBahn: Why are Legacy SIEMs a problem? The SIEM Cost Spiral Security Leaders Face
By the numbers:
- Organizations applying pre-SIEM filtering and enrichment have reduced SIEM-bound data volume by 50 to 70 percent, cutting licensing costs by more than half.
Questions worth separating out
Q: How should security teams reduce SIEM costs without creating blind spots?
A: Security teams should move from ingest-everything thinking to governed data routing.
Q: Why does pre-ingestion enrichment matter for SOC governance?
A: It changes logging from a storage problem into a policy problem.
Q: What do teams get wrong about reducing SIEM telemetry volume?
A: They often assume less data automatically means better control.
Practitioner guidance
- Implement pre-ingestion relevance filtering Move duplicate removal, heartbeat suppression, and verbose debug log filtering ahead of premium SIEM ingestion so you only pay full price for events that support detection or audit needs.
- Route telemetry by investigative value Create distinct paths for high-value security events, low-value operational logs, and long-retention compliance records, then test that each path preserves the data needed for investigations.
- Enrich identity and asset context upstream Attach user, asset, location, and threat-intel context before ingestion so analysts do not have to reconstruct those fields later across separate tools.
What's in the full article
DataBahn's full analysis covers the operational detail this post intentionally leaves for the source:
- Exact pipeline stages for pre-ingestion filtering, enrichment, and routing across SIEM, archive, and alternate destinations.
- Examples of how collectors, stream enrichment, and schema normalisation are combined in a live SOC data path.
- Cost and performance implications of different retention tiers, including what to keep hot and what to push lower.
- Implementation context for teams that need to reduce ingestion spend without losing investigation-ready evidence.
👉 Read DataBahn's analysis of SIEM cost control and pre-ingestion enrichment →
Pre-ingestion enrichment for SIEM cost control: are your controls keeping up?
Explore further
02/08/2026 12:59 pm
Pre-ingestion relevance is the new control plane for telemetry. When enterprises pay premium SIEM rates for every byte, the real governance decision shifts upstream to whether an event deserves to be ingested at all. That makes enrichment, routing, and tiering part of security architecture rather than data plumbing. For teams governing SOC telemetry, the control point is the pipeline, not the search screen.
A question worth separating out:
Q: Who should own decisions about telemetry tiering and retention?
A: Security operations, identity, and platform teams should own it together because telemetry routing affects detections, audit evidence, and budget. If these decisions sit only with infrastructure or procurement, the organisation will optimise for storage cost instead of security outcomes and accountability.
👉 Read our full editorial: Pre-ingestion enrichment is reshaping SIEM cost control
