Bazel ecosystem usage stats, now public

Aspect has launched a public Bazel ecosystem statistics page that aggregates daily telemetry from repositories using its open-source rulesets, showing Bazel version adoption and dependency-version trends for Bazel Central Registry modules, with CI and non-CI activity separated. The data is intended to help ruleset maintainers make better-informed compatibility and deprecation decisions, though report counts reflect dependency graph evaluations rather than unique users or repositories and are weighted toward CI activity. Telemetry is collected by the open-source `aspect_tools_telemetry` module during bzlmod module-graph evaluations, generally not during routine builds and never for WORKSPACE-only builds, and it sends limited platform, Bazel, dependency, CI, and pseudonymous grouping information rather than source code, paths, URLs, or command lines. Users can permanently disable collection with the `DO_NOT_TRACK` setting, selectively exclude fields such as organization or dependencies, add a salt to hashes, or redirect reports to an internal collector. The underlying aggregated JSON dataset is publicly available but is not presented as a stable API, and other ruleset maintainers can adopt the telemetry module to obtain more direct insight into their own users’ version adoption.

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