feat: Do not spam sentry_sdk.warnings logger w/ Spotlight (#4219)

Sometimes one may have Spotlight turned on in the SDK but not have the
sidecar running or reachable. In that case we spam the console with
every event as they fail to reach Spotlight. This patch limits the fail
warnings to 3: the first 2 are actual errors and the final one is a note
about shutting up.

Author: BYK

sentry_sdk/spotlight.py

@@ -38,7 +38,7 @@ def __init__(self, url):
         # type: (str) -> None
         self.url = url
         self.http = urllib3.PoolManager()
-        self.tries = 0
+        self.fails = 0
 
     def capture_envelope(self, envelope):
         # type: (Envelope) -> None
@@ -54,9 +54,18 @@ def capture_envelope(self, envelope):
                 },
             )
             req.close()
+            self.fails = 0
         except Exception as e:
-            # TODO: Implement buffering and retrying with exponential backoff
-            sentry_logger.warning(str(e))
+            if self.fails < 2:
+                sentry_logger.warning(str(e))
+                self.fails += 1
+            elif self.fails == 2:
+                self.fails += 1
+                sentry_logger.warning(
+                    "Looks like Spotlight is not running, will keep trying to send events but will not log errors."
+                )
+            # omitting self.fails += 1 in the `else:` case intentionally
+            # to avoid overflowing the variable if Spotlight never becomes reachable
 
 
 try: