fix: sample high-volume "Token required" Sentry errors at 1%

The CLI-S issue has ~21M occurrences of "Token required - not valid
tokenless upload" errors flooding Sentry. Add a before_send hook that
randomly drops 99 out of 100 events matching this message pattern,
reducing volume while still capturing representative samples.

Author: thomasrockhu-codecov

codecov-cli/codecov_cli/opentelemetry.py

@@ -1,10 +1,27 @@
 import os
-import time
+import random
 
 import sentry_sdk
 
 from codecov_cli import __version__
 
+_SAMPLED_MESSAGES = [
+    "Token required",
+]
+_SAMPLE_RATE = 100
+
+
+def _before_send(event, hint):
+    message = (event.get("logentry") or {}).get("message", "")
+    if not message:
+        message = event.get("message", "")
+    for pattern in _SAMPLED_MESSAGES:
+        if pattern in message:
+            if random.randint(1, _SAMPLE_RATE) != 1:
+                return None
+            break
+    return event
+
 
 def init_telem(ctx):
     if ctx["disable_telem"]:
@@ -19,6 +36,7 @@ def init_telem(ctx):
         enable_tracing=True,
         environment=os.getenv("CODECOV_ENV", "production"),
         release=f"cli@{__version__}",
+        before_send=_before_send,
     )