actions/cache joined the watched set.

{"event":"population_change","format_version":1,"population_change":{"change":"added","reason":{"type":"seed"}},"prev_hash":"sha256:1c6ea2042039f531664f52d5ea5e749f8f0b9be47f44e23dd9723bbcaf3b0b8e","recorded_at":"2026-09-29T18:53:44.590Z","repo":"actions/cache","seq":4,"source_observations":["01M3Q88QBFR1XP9CMB2NWR7X0K"]}

The SHA-256 of these bytes is this entry's hash (7226b70a). The next entry begins with it. Change one byte, and the chain breaks.