add environment based sentry sdk configuration

synapse/app/_base.py

@@ -662,9 +662,14 @@ def setup_sentry(hs: "HomeServer") -> None:
 
     import sentry_sdk
 
+    # Set a default environment if it's not configured
+    default_environment = ""
+    environment = hs.config.metrics.sentry_environment or default_environment
+
     sentry_sdk.init(
         dsn=hs.config.metrics.sentry_dsn,
         release=SYNAPSE_VERSION,
+        environment=environment
     )
 
     # We set some default tags that give some context to this instance

synapse/config/metrics.py

@@ -61,6 +61,7 @@ class MetricsConfig(Config):
             check_requirements("sentry")
 
             self.sentry_dsn = config["sentry"].get("dsn")
+            self.sentry_environment = config["sentry"].get("environment")
             if not self.sentry_dsn:
                 raise ConfigError(
                     "sentry.dsn field is required when sentry integration is enabled"