docs(sessions): Retire session.duration field (#43169)

api-docs/paths/releases/sessions.json

@@ -32,7 +32,7 @@
       {
         "name": "field",
         "in": "query",
-        "description": "The list of fields to query.\n\nThe available fields are\n  - `sum(session)`\n  - `count_unique(user)`\n  - `avg`, `p50`, `p75`, `p90`, `p95`, `p99`, `max` applied to `session.duration`. For example, `p99(session.duration)`\n  - `crash_rate`, `crash_free_rate` applied to `user` or `session`. For example, `crash_free_rate(user)`",
+        "description": "The list of fields to query.\n\nThe available fields are\n  - `sum(session)`\n  - `count_unique(user)`\n  - `avg`, `p50`, `p75`, `p90`, `p95`, `p99`, `max` applied to `session.duration`. For example, `p99(session.duration)`. Session duration is [no longer being recorded](https://github.com/getsentry/sentry/discussions/42716) as of on Jan 12, 2023. Returned data may be incomplete.\n  - `crash_rate`, `crash_free_rate` applied to `user` or `session`. For example, `crash_free_rate(user)`",
         "required": true,
         "schema": {
           "type": "array",