Always sample checkin regardless of sample_rate

sentry_sdk/client.py

@@ -530,12 +530,16 @@ def capture_event(
             self._update_session_from_event(session, event)
 
         is_transaction = event_opt.get("type") == "transaction"
+        is_checkin = event_opt.get("type") == "check_in"
 
-        if not is_transaction and not self._should_sample_error(event):
+        if (
+            not is_transaction
+            and not is_checkin
+            and not self._should_sample_error(event)
+        ):
             return None
 
         tracing_enabled = has_tracing_enabled(self.options)
-        is_checkin = event_opt.get("type") == "check_in"
         attachments = hint.get("attachments")
 
         trace_context = event_opt.get("contexts", {}).get("trace") or {}

tests/test_crons.py

@@ -81,6 +81,18 @@ def test_capture_checkin_simple(sentry_init):
     assert check_in_id == "112233"
 
 
+def test_sample_rate_doesnt_affect_crons(sentry_init, capture_envelopes):
+    sentry_init(sample_rate=0)
+    envelopes = capture_envelopes()
+
+    capture_checkin(check_in_id="112233")
+
+    assert len(envelopes) == 1
+
+    check_in = envelopes[0].items[0].payload.json
+    assert check_in["check_in_id"] == "112233"
+
+
 def test_capture_checkin_new_id(sentry_init):
     sentry_init()
 

tests/tracing/test_sampling.py

@@ -2,7 +2,7 @@
 
 import pytest
 
-from sentry_sdk import Hub, start_span, start_transaction
+from sentry_sdk import Hub, start_span, start_transaction, capture_exception
 from sentry_sdk.tracing import Transaction
 from sentry_sdk.utils import logger
 
@@ -226,6 +226,18 @@ def test_passes_custom_samling_context_from_start_transaction_to_traces_sampler(
     )
 
 
+def test_sample_rate_affects_errors(sentry_init, capture_events):
+    sentry_init(sample_rate=0)
+    events = capture_events()
+
+    try:
+        1 / 0
+    except Exception:
+        capture_exception()
+
+    assert len(events) == 0
+
+
 @pytest.mark.parametrize(
     "traces_sampler_return_value",
     [