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GitHub Actions refuses to instantiate a matrix that would generate more than 256 jobs. It does so silently: the job hangs forever at "Waiting for pending jobs" and the whole run is marked `failure` while every other job stays green. This is exactly what happened on the v4.6.1 tag build (run 28786533892): the single-arch build matrix had grown to 268 entries, so `backend-jobs-singlearch` (and its downstream merge) never produced a single job, and the release build "failed" with no failing job to point at. The single-arch list is the one that grows unbounded as backends are added, so shard it across a fixed number of matrix jobs (SINGLEARCH_SHARDS=4, ~67 entries each today, headroom to ~1020 backends). Each merge shard `needs:` only its matching build shard, preserving the "merge waits only on its own build" property that keeps slow CUDA/ROCm builds from gating multi-arch manifest assembly. changed-backends.js now emits per-shard matrix/has-* outputs and throws loudly if a shard ever reaches the 256 limit (telling the maintainer to bump SINGLEARCH_SHARDS and add matching job blocks) instead of letting GitHub drop the overflow silently. backend.yml and backend_pr.yml define the four build + four merge shard jobs; multi-arch and darwin groups are untouched. Assisted-by: Claude:claude-opus-4-8 [Claude Code] Signed-off-by: Ettore Di Giacinto <mudler@localai.io> Co-authored-by: Ettore Di Giacinto <mudler@localai.io>