Error tracking tools collect crash reports, stack traces and performance traces from websites, mobile apps and back-end services, group them into issues and alert developers. Teams use them to find and fix defects quickly, link errors to releases and see which users or versions are affected. Sentry is a widely known reference point.
The sovereignty concern is what travels with an error. Reports often contain request data, user identifiers, session details and sometimes fragments of memory or variables that include personal data or secrets such as tokens. All of it is sent to an external service, so the provider's jurisdiction and sub-processors matter, as does how much scrubbing happens before data leaves your systems. Because SDKs are embedded in your own code, switching also means touching every application that reports errors.
When looking at a European option, check whether data can be scrubbed on the client or at ingestion, how long events are retained and who can inspect them, and whether you can choose the hosting region. Self-hosting is particularly relevant here, as is compatibility with widely used SDK protocols, which keeps the cost of changing provider low.