Tracker›Changelog›2026-09-25-endpoint-sentinel-heartbeat-removed

Endpoint /backend-api/sentinel/heartbeat no longer observed

observedstructure · endpoint2026-09-25-endpoint-sentinel-heartbeat-removed

Instrument state: Schema 22 · v2 · Bookmarklet 2.7 · measure · gpt-5-6

Evidence

Before

{
  "endpoint": [
    "/backend-api/sentinel/heartbeat"
  ]
}

Breadth

26/33 prompts · global

Modes

instant + thinking

Measuring days

25 Sept 2026 · 35 field diffs in events.jsonl

Raw data excerpt (K1-01__instant, 2026-09-25)

{
  "schema_fingerprint.endpoints_seen": [
    "GET /backend-api/accounts/check/v4-2023-04-27",
    "GET /backend-api/accounts/optimized/check",
    "GET /backend-api/aip/first-party/eligibility",
    "GET /backend-api/amphora/notifications",
    "GET /backend-api/automations",
    "GET /backend-api/beacons/home",
    "GET /backend-api/celsius/ws/user",
    "GET /backend-api/composer/items",
    "GET /backend-api/conversations",
    "GET /backend-api/conversations/{id}",
    "GET /backend-api/gizmos/snorlax/sidebar",
    "GET /backend-api/hazelnuts",
    "GET /backend-api/me",
    "GET /backend-api/models",
    "GET /backend-api/pageConfigs/billing",
    "GET /backend-api/pins",
    "GET /backend-api/ps/plugins/installed",
    "GET /backend-api/settings/is_adult",
    "GET /backend-api/settings/user",
    "GET /backend-api/subscriptions",
    "GET /backend-api/system_hints",
    "GET /backend-api/tpp/default-tab-recommendation",
    "GET /backend-api/tpp/models/",
    "GET /backend-api/user_granular_consent",
    "GET /backend-api/wham/accounts/check",
    "GET /backend-api/wham/profiles/me",
    "GET /backend-api/wham/sites/access",
    "GET /backend-api/wham/tasks/list",
    "GET /backend-api/wham/usage",
    "GET /backend-api/wham/usage/stream",
    "PATCH /backend-api/settings/user_last_used_model_config",
    "POST /backend-api/aip/connectors/links/list_accessible",
    "POST /backend-api/amphora/clear_settings_cache",
    "POST /backend-api/composer/items/interactions",
    "POST /backend-api/conversation/init",
    "POST /backend-api/conversations/batch",
    "POST /backend-api/f/conversation",
    "POST /backend-api/f/conversation/prepare",
    "POST /backend-api/ps/apps/batch",
    "POST /backend-api/sentinel/chat-requirements/finalize",
    "POST /backend-api/
…

Daily data of 25 Sept 2026 →

Context

endpoint/backend-api-sentinel-heartbeat

Impact

No evidenced impact.

Status history

25 Sept 2026

observed