OpenObserve is an observability platform for logs, metrics, traces and other telemetry, published by OpenObserve Inc. It can run locally, be deployed on Kubernetes (the documentation describes a high-availability setup) or be used through the vendor's cloud sign-up. According to the vendor, organisations send telemetry from their own collectors into storage they control. The project presents itself as an alternative to commercial log and monitoring suites and is distributed as a single binary.
The company lists an address in Menlo Park, California, so it is a US company subject to US law, including the CLOUD Act for data it holds. The source code is published under the AGPL-3.0 licence, which allows an organisation to run the software on European infrastructure and keep its data there. The vendor's website does not state where its hosted cloud stores data or whether an EU region exists, so a European organisation considering the managed service should request those details in writing.