ref: span normalization allowed host config (#3245)

Co-authored-by: Hubert Deng <[email protected]>

Author: aldy505

sentry/sentry.conf.example.py

@@ -380,7 +380,6 @@ def get_internal_network():
 
 # Configure Sentry JS SDK bundle URL template for Loader Scripts.
 # Learn more about the Loader Scripts: https://docs.sentry.io/platforms/javascript/install/loader/
-
 # If you wish to host your own JS SDK bundles, set `SETUP_JS_SDK_ASSETS` environment variable to `1`
 # on your `.env` or `.env.custom` file. Then, replace the value below with your own public URL.
 # For example: "https://sentry.example.com/js-sdk/%s/bundle%s.min.js"
@@ -394,3 +393,15 @@ def get_internal_network():
 
 # If you would like to use self-hosted Sentry with only errors enabled, please set this
 SENTRY_SELF_HOSTED_ERRORS_ONLY = env("COMPOSE_PROFILES") != "feature-complete"
+
+#####################
+# Insights Settings #
+#####################
+
+# Since version 24.3.0, Insights features are available on self-hosted. For Requests module,
+# there are scrubbing logic done on Relay to prevent high cardinality of stored HTTP hosts.
+# However in self-hosted scenario, the amount of stored HTTP hosts might be consistent,
+# and you may have allow list of hosts that you want to keep. Uncomment the following line
+# to allow specific hosts. It might be IP addresses or domain names (without `http://` or `https://`).
+
+# SENTRY_OPTIONS["relay.span-normalization.allowed_hosts"] = ["example.com", "192.168.10.1"]