Play README: request telemetry (telemetry_samples, one-minute aggregates, 14 days) (#15)

ddiff --git a/README.md b/README.md
iindex bf34a4c..affdade 100644
---- a/README.md
++++ b/README.md
@@@ -35,6 +35,10 @@ game, to the player's account page and to any page that wants a board.
  - Unlocks and scores per player (`play_unlocks`, `play_scores`), guest adoption, and the merges applied
    (`play_subject_merges`).
  - The public pages at play.openvibe.network and the `/api/v1` read and write API.
++- Request telemetry (`telemetry_samples`, `0003_telemetry.sql`): each HTTP request aggregated by route template, method, status class,
++  never by raw URL; `/shared`, static assets, health, readiness and `/metrics` are not counted. `server/app.js` builds the collector,
++  `server/index.js` flushes per key one `http.request` sample plus the active-requests, p95 latency and event-loop-lag gauges each
++  minute and on stop (openvibe-sdk 0.46, `platform.telemetry-sample@1`), and rows older than 14 days are deleted daily.
  
  ## Does not own