Remove logic for actually enabling ParentBasedSampler

Author: mtoffl01

dd-trace-core/src/main/java/datadog/trace/common/sampling/Sampler.java

@@ -80,8 +80,7 @@ public static Sampler forConfig(final Config config, final TraceConfig traceConf
             log.error("Invalid sampler configuration. Using AllSampler", e);
             sampler = new AllSampler();
           }
-        } else if (config.isTraceOtlpExporterEnabled()) {
-          sampler = new ParentBasedAlwaysOnSampler();
+          // TODO: if OTLP trace export enabled, select ParentBasedAlwaysOnSampler here
         } else if (config.isPrioritySamplingEnabled()) {
           if (KEEP.equalsIgnoreCase(config.getPrioritySamplingForce())) {
             log.debug("Force Sampling Priority to: SAMPLER_KEEP.");

dd-trace-core/src/test/groovy/datadog/trace/common/sampling/SamplerTest.groovy

@@ -66,53 +66,4 @@ class SamplerTest extends DDSpecification{
     then:
     !(sampler instanceof AsmStandaloneSampler)
   }
-
-  void "test that ParentBasedAlwaysOnSampler is selected when otlp traces exporter enabled"() {
-    setup:
-    System.setProperty("dd.trace.otel.exporter", "otlp")
-    Config config = new Config()
-
-    when:
-    Sampler sampler = Sampler.Builder.forConfig(config, null)
-
-    then:
-    sampler instanceof ParentBasedAlwaysOnSampler
-  }
-
-  void "test that ParentBasedAlwaysOnSampler is not selected when otlp traces exporter not set"() {
-    setup:
-    Config config = new Config()
-
-    when:
-    Sampler sampler = Sampler.Builder.forConfig(config, null)
-
-    then:
-    !(sampler instanceof ParentBasedAlwaysOnSampler)
-  }
-
-  void "test that user-defined sampling rules take precedence over otlp default sampler"() {
-    setup:
-    System.setProperty("dd.trace.otel.exporter", "otlp")
-    System.setProperty("dd.trace.sample.rate", "0.5")
-    Config config = new Config()
-
-    when:
-    Sampler sampler = Sampler.Builder.forConfig(config, null)
-
-    then:
-    sampler instanceof RuleBasedTraceSampler
-  }
-
-  void "test that DD_TRACE_SAMPLING_RULES takes precedence over otlp default sampler"() {
-    setup:
-    System.setProperty("dd.trace.otel.exporter", "otlp")
-    System.setProperty("dd.trace.sampling.rules", '[{"sample_rate": 0.5}]')
-    Config config = new Config()
-
-    when:
-    Sampler sampler = Sampler.Builder.forConfig(config, null)
-
-    then:
-    sampler instanceof RuleBasedTraceSampler
-  }
 }