chore: log warning if both tracesSampleRate and tracesSampler are set (#1701)

* Log warning if both tracesSampleRate and tracesSampler are set

* Update CHANGELOG

* Update log

* Update CHANGELOG

Author: buenaflor

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Enhancements
+
+- Log warning if both tracesSampleRate and tracesSampler are set ([#1701](https://github.com/getsentry/sentry-dart/pull/1701))
+
 ### Features
 
 - Initial (alpha) support for profiling on iOS and macOS ([#1611](https://github.com/getsentry/sentry-dart/pull/1611))

dart/lib/src/sentry_traces_sampler.dart

@@ -14,7 +14,12 @@ class SentryTracesSampler {
   SentryTracesSampler(
     this._options, {
     Random? random,
-  }) : _random = random ?? Random();
+  }) : _random = random ?? Random() {
+    if (_options.tracesSampler != null && _options.tracesSampleRate != null) {
+      _options.logger(SentryLevel.warning,
+          'Both tracesSampler and traceSampleRate are set. tracesSampler will take precedence and fallback to traceSampleRate if it returns null.');
+    }
+  }
 
   SentryTracesSamplingDecision sample(SentrySamplingContext samplingContext) {
     final samplingDecision =