chore(explore): Add new referrer for explore in events (#76256)

Adds the new referrer for the explore span samples table.

Author: Zylphrex

src/sentry/api/endpoints/organization_events.py

@@ -126,6 +126,7 @@ class DiscoverDatasetSplitException(Exception):
     Referrer.API_PERFORMANCE_MOBILE_UI_METRICS_RIBBON.value,
     Referrer.API_PERFORMANCE_SPAN_SUMMARY_HEADER_DATA.value,
     Referrer.API_PERFORMANCE_SPAN_SUMMARY_TABLE.value,
+    Referrer.API_EXPLORE_SPANS_SAMPLES_TABLE,
 }
 
 API_TOKEN_REFERRER = Referrer.API_AUTH_TOKEN_EVENTS.value
@@ -386,6 +387,11 @@ def get(self, request: Request, organization) -> Response:
         if request.auth:
             referrer = API_TOKEN_REFERRER
         elif referrer not in ALLOWED_EVENTS_REFERRERS:
+            with sentry_sdk.isolation_scope() as scope:
+                scope.set_tag("forbidden_referrer", referrer)
+                sentry_sdk.capture_message(
+                    "Forbidden Referrer. If this is intentional, add it to `ALLOWED_EVENTS_REFERRERS`"
+                )
             referrer = Referrer.API_ORGANIZATION_EVENTS.value
 
         def _data_fn(scoped_dataset, offset, limit, query) -> dict[str, Any]:

src/sentry/snuba/referrer.py

@@ -91,6 +91,7 @@ class Referrer(Enum):
     API_DISCOVER_TRANSACTIONS_LIST = "api.discover.transactions-list"
     API_EVENTS_MEASUREMENTS = "api.events.measurements"
     API_EVENTS_VITALS = "api.events.vitals"
+    API_EXPLORE_SPANS_SAMPLES_TABLE = "api.explore.spans-samples-table"
     API_GROUP_EVENTS_ERROR_DIRECT_HIT = "api.group-events.error.direct-hit"
     API_GROUP_EVENTS_ERROR = "api.group-events.error"
     API_GROUP_EVENTS_PERFORMANCE_DIRECT_HIT = "api.group-events.performance.direct-hit"