drpc: accesslog-shipper sidecar (NDJSON tail -> splits listener)

Decoupled by design: dshackle writes the file regardless; a dead listener
or slow link stalls only the busybox sidecar. Retry resumes at file end
(bounded loss); the listener-side prometheus reconciliation surfaces gaps.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

drpc.yml

@@ -1,12 +1,26 @@
 services:
+  # Streams the dshackle access log (NDJSON, one line per response) to the splits
+  # listener on the insights host. Deliberately decoupled from dshackle via the
+  # file: a dead listener or slow link only ever stalls this sidecar, never the
+  # gateway. tail -F follows logrotate copytruncate; on disconnect the retry
+  # loop resumes at the file END (bounded loss, no duplication floods) — the
+  # per-gateway prometheus-vs-lines reconciliation on the listener side makes
+  # any gap visible within the hour.
+  accesslog-shipper:
+    image: busybox:1.36
+    restart: unless-stopped
+    volumes:
+      - ./dshackle_logs:/logs:ro
+    command: sh -c 'while true; do tail -F /logs/access_log.jsonl 2>/dev/null | nc ${SPLITS_LISTENER_HOST:-78.47.193.225} ${SPLITS_LISTENER_PORT:-9102}; echo "shipper: listener connection lost, retrying in 10s"; sleep 10; done'
+
   dshackle:
     image: drpcorg/dshackle:0.79.10
     restart: unless-stopped
     volumes:
       - ./main_configs:/etc/dshackle
       # dshackle accessLog target (main_configs/dshackle.yaml accessLog.filename=/logs/...).
-      # Host-side dir so the splits tailer can aggregate gateway->region request shares
+      # Host-side dir so the shipper sidecar above can stream gateway->region request
-      # (earnings misattribution fix, operator + claude-machine design 2026-07-09).
+      # shares (earnings misattribution fix, operator + claude-machine design 2026-07-09).
       - ./dshackle_logs:/logs
     expose:
       - 8080