feat: Use logging and suppress errors

Also, use different names for the two receivers. (Had accidentally called
both `..._change`.)

edx_arch_experiments/config_watcher/signals/receivers.py

@@ -4,19 +4,23 @@
 Call ``connect_receivers`` to initialize.
 """
 
+import logging
+
 import waffle.models
 from django.db.models import signals
 from django.dispatch import receiver
 
+log = logging.getLogger(__name__)
+
 
 def _report_waffle_change(model_short_name, instance, created, fields):
     verb = "created" if created else "updated"
     state_desc = ", ".join(f"{field}={repr(getattr(instance, field))}" for field in fields)
-    print(f"⚡⚡⚡ Waffle {model_short_name} {instance.name!r} was {verb}. New config: {state_desc}")
+    log.info(f"Waffle {model_short_name} {instance.name!r} was {verb}. New config: {state_desc}")
 
 
 def _report_waffle_delete(model_short_name, instance):
-    print(f"💥💥💥 Waffle {model_short_name} {instance.name!r} was deleted")
+    log.info(f"Waffle {model_short_name} {instance.name!r} was deleted")
 
 
 _WAFFLE_MODELS_TO_OBSERVE = [
@@ -48,12 +52,19 @@ def _register_waffle_observation(*, model, short_name, fields):
         fields (list): Names of fields to report on in the Slack message
     """
     @receiver(signals.post_save, sender=model)
-    def log_waffle_change(*args, instance, created, **kwargs):
-        _report_waffle_change(short_name, instance, created, fields)
+    def report_waffle_change(*args, instance, created, **kwargs):
+        try:
+            _report_waffle_change(short_name, instance, created, fields)
+        except:
+            # Log and suppress error so Waffle change can proceed
+            log.exception(f"Failed to report change to waffle {short_name}")
 
     @receiver(signals.post_delete, sender=model)
-    def log_waffle_change(*args, instance, **kwargs):
-        _report_waffle_delete(short_name, instance)
+    def report_waffle_delete(*args, instance, **kwargs):
+        try:
+            _report_waffle_delete(short_name, instance)
+        except:
+            log.exception(f"Failed to report deletion of waffle {short_name}")
 
 
 def connect_receivers():