POST /observability/flush handles what the collector has queued and writes it, so the soak harness no longer sleeps FLUSH_INTERVAL_S before clearing its own rows. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WgBfkm4rCmtd1T4vHWjEPx