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Service 06

Detection-Aware Filter Engines for Security & Monitoring Logs

We design and build detection-aware filter engines that sit between your log sources and your SIEM or observability platform — dropping what adds no detection value, enriching what does, and routing everything to the right tier. Every drop rule is validated against your active detection content before it goes live, so cost falls and coverage doesn't.

Cribl StreamDataBahnVectorFluent BitLogstashOpenTelemetry CollectorFluentd
Measured Outcomes
What a Detection-Aware Filter Engine Delivers
30–70%
Reduction in SIEM ingestion volume through detection-safe drop rules, deduplication, and field pruning
0
Broken detections — every filter rule is mapped against your active use cases before deployment
100%
Compliance retention preserved — full-fidelity copies routed to low-cost archive tiers for audit and forensics
2–4 wks
Typical time to first measurable ingestion reduction in a phased, source-by-source rollout
License
Lower SIEM licensing & infrastructure spend — pay to analyse signal, store noise cheaply
1
Vendor-neutral control point — switch or add SIEM/analytics destinations without re-plumbing sources
Why Detection-Aware

Filtering Without Breaking Detections

Most filtering projects fail the same way: volume drops, and three months later an incident reveals a detection silently starved of its data. Our approach inverts the order — detections first, filters second.

01

Detection Dependency Mapping

Before any rule is written, we inventory your active detection content and map every rule to the log sources, event types, and fields it depends on.

  • Full detection-to-telemetry dependency matrix
  • Field-level usage analysis per log source
  • Identification of zero-detection-value sources and fields
  • MITRE ATT&CK coverage baseline before filtering
Outcome: You know exactly what is safe to drop — with evidence
02

Filter Engine Architecture & Build

We design and build the pipeline itself — engine selection, sizing, high availability, and placement (on-prem, cloud, or hybrid).

  • Engine selection: Cribl, DataBahn, or open source (Vector, Fluent Bit, Logstash, OTel Collector, Fluentd)
  • HA topology, capacity sizing, and back-pressure handling
  • Parsing, normalization, and schema mapping (ECS, CIM, OCSF)
  • Enrichment: GeoIP, asset, identity, and threat-intel lookups
Outcome: A production-grade pipeline your team can operate
03

Detection-Safe Drop & Reduction Rules

Volume reduction engineered against the dependency map — never guesswork.

  • Drop, sample, dedupe, and aggregate rules per source
  • Field pruning of unused metadata and padding
  • Verbose source suppression (firewall allows, DNS NOERROR, health checks)
  • Pre/post validation that every detection still fires on test data
Outcome: 30–70% less ingestion, zero broken use cases
04

Tiered Routing & Storage Strategy

The right data in the right system at the right cost.

  • Detection-relevant events → SIEM (hot)
  • Investigation & hunting data → search tier (warm)
  • Full-fidelity compliance copy → object storage / data lake (cold)
  • Replay capability from archive back into the SIEM when needed
Outcome: Compliance retention at a fraction of SIEM storage cost
05

Detection Rebaselining

After filtering goes live, we re-tune detection content against the new data profile.

  • Re-validation of thresholds, aggregations, and statistical rules
  • Alert-volume and fidelity comparison before vs. after
  • Updated MITRE ATT&CK coverage map post-filtering
  • Tuning of rules affected by sampling or aggregation
Outcome: Documented proof that coverage survived the cost cut
06

Operations Handover & Pipeline-as-Code

Your team owns the engine after we exit.

  • Pipeline configuration as code in version control
  • Monitoring of pipeline health, lag, and drop ratios
  • Runbooks for adding sources and modifying rules safely
  • Hands-on training for SOC and platform engineers
Outcome: No vendor lock-in, no consultant dependency
Filter Engines We Support

Commercial & Open-Source Engines

We are engine-neutral: we recommend and build on the platform that fits your volume, budget, and team — commercial where it earns its license, open source where it doesn't.

Commercial

Cribl Stream

Enterprise-grade observability pipeline. We design routes, pipelines, and packs — detection-safe drop rules, field pruning, lookup enrichment, and multi-destination tiered routing to SIEM, data lake, and archive.

Commercial

DataBahn

AI-powered security data fabric. We architect collection, reduction, and routing policies that keep detection-relevant telemetry in your SIEM while diverting bulk data to low-cost storage.

Open Source

Vector

High-performance Rust-based pipeline by Datadog. We build VRL transforms for filtering, parsing, and enrichment — a zero-license filter engine with exceptional throughput per core.

Open Source

Fluent Bit

Lightweight CNCF-graduated processor ideal for edge and Kubernetes. We engineer filters, parsers, and stream processors that reduce volume before it ever leaves the node.

Open Source

Logstash

The battle-tested Elastic pipeline. We optimise grok/dissect parsing, conditional routing, and drop filters — and tune JVM and pipeline workers for sustained throughput.

Open Source

OpenTelemetry Collector

Vendor-neutral CNCF standard for logs, metrics, and traces. We build processor chains (filter, transform, tail sampling) and OTTL rules for unified, future-proof telemetry pipelines.

Open Source

Fluentd

Mature CNCF log router with a vast plugin ecosystem. We design tag-based routing, buffering, and filter plugins for reliable multi-destination delivery at scale.

What You Get

Deliverables You Receive

🗺️

Detection Dependency Matrix

Every active detection mapped to the sources and fields it consumes

🏗️

Filter Engine Architecture Design

Topology, sizing, HA, and placement documentation for the chosen engine

⚙️

Production Pipeline Configuration

Versioned, documented pipeline-as-code with validated drop and routing rules

📊

Before/After Volume & Cost Report

Measured ingestion reduction per source with projected licensing savings

🎯

Post-Filter Detection Validation Report

Evidence that every use case still fires — including rebaselined thresholds

📚

Operations Runbook & Training

Procedures for safely adding sources, changing rules, and monitoring the pipeline

Paying Your SIEM to Analyse Noise?

Book a free 45-minute discovery call. We'll review your top ingestion sources and show you where a detection-aware filter engine would cut cost without touching coverage.