Sources README: request telemetry (telemetry_samples, one-minute aggregates, 14 days) (#60)

ddiff --git a/README.md b/README.md
iindex 98f05bf..5de295d 100644
---- a/README.md
++++ b/README.md
@@@ -42,6 +42,14 @@ the fetch queue (`sources_fetch_due`, `sources_fetch_oldest_wait_seconds`,
  `sources_fetch_in_flight`), `sources_last_fetch_timestamp_seconds` and
  `sources_last_success_timestamp_seconds`.
  
++Requests are aggregated by route template, method and status class, never by raw URL; health,
++readiness, `/metrics`, `/shared` and static files are not counted. Once a minute one `http.request`
++sample per key, plus the active-requests, p95 and event-loop-lag gauges, is written to this service's
++own `telemetry_samples` table (openvibe-sdk 0.46 telemetry, `platform.telemetry-sample@1`, migration
++`0003_telemetry.sql`); rows older than 14 days are deleted daily. `server/app.js` mounts the SDK's
++no-op-until-init `telemetryMiddleware`; `server/index.js` calls `telemetry.init()` at production
++start and flushes on stop.
++
  ## The registry
  
  A source records: `key`, `name`, `type` (`rss|atom|sitemap|jsonld|api|manual`), `category`