In the legacy era, a SIEM was a ‘black hole’—once your data entered a proprietary database, the cost and complexity of extracting it made switching vendors nearly impossible. In the SIEM++ era, avoiding lock-in is no longer just a preference, it is a technical requirement for agility and cost-control. To maintain your ’freedom of data navigation’, modern buyers must evaluate providers based on these four architectural non-negotiables-
- Mandate the ‘Lingua Franca’- OSF
The greatest source of lock-in is proprietary data schemas. If your detection rules only work in one vendor’s language, you are trapped.
- The SIEM++ requirement- Native support for the open schema framework.
- The impact- OSF standardises data into a vendor-agnostic taxonomy. This allows you to ‘write once and query anywhere’, ensuring your detection logic persists even if you change your storage or analytics provider.
- Demand Decoupled Storage
Traditional SIEMs bundled storage and compute, forcing you to pay ‘ingestion taxes’ to keep data searchable.
- The SIEM++ requirement- A Decoupled Architecture where raw telemetry is stored in open formats (like Parquet or JSON) in a security data lake you own (e.g., Amazon S3, Snowflake, or Google Cloud Storage).
- The impact- By owning the storage layer, you can ‘fan out’ data to multiple tools simultaneously and avoid the massive egress fees associated with moving petabytes of data out of a proprietary silo.
- Prioritise Federated Search
The ‘centralise-or-fail’ model of the 2010s is a primary driver of vendor dependency.
- The SIEM++ requirement- Federated Search capabilities that allow analysts to query data directly at the source—whether in SaaS apps, cloud buckets, or a legacy database—without prior ingestion.
- The impact- Federation respects Data Sovereignty and avoids ‘data gravity’ traps. You only move the results of the query, not the raw data, preserving your agility to adopt new tools without a six-month migration project.
- Deploy Vendor-Neutral Pipelines
Proprietary ingestion engines often act as a ‘hidden’ lock-in mechanism, making it difficult to route data to different destinations.
- The SIEM++ requirement- An independent Security Data Pipeline (SDPP) that performs in-stream normalisation and filtering.
- The impact- A neutral pipeline allows you to route high-fidelity logs to your ‘hot’ SIEM for real-time alerts while sending bulk telemetry to a ‘cold’ data lake for long-term forensics, reducing TCO by up to .
The Bottom Line for CISOs If a vendor cannot explain how you would exit their platform in 2028, you are buying a legacy silo, not a modern ecosystem. True SIEM++ readiness is defined by interoperability– your data should be portable, your schema should be open, and your AI should be able to reason across a multi-vendor stack.
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