remove explicit filter to simplify span stacktrace declarative config (#1117)

* span stacktrace filtering simplification with DC

* simplify remove span stacktrace filtering

* manually add changelog entry

Author: SylvainJuge

custom/src/main/java/co/elastic/otel/ElasticAutoConfigurationCustomizerProvider.java

@@ -173,8 +173,6 @@ private static void spanStackTrace(
       }
       config.put(STACKTRACE_OTEL_DURATION, value);
     }
-
-    config.put(STACKTRACE_OTEL_FILTER, SpanStackTraceFilter.class.getName());
   }
 
   private static void indyInstrumentation(

custom/src/main/java/co/elastic/otel/SpanStackTraceFilter.java

@@ -40,8 +40,6 @@ tracer_provider:
     # Requires the span-stacktrace extension (included in EDOT)
     # https://github.com/open-telemetry/opentelemetry-java-contrib/tree/main/span-stacktrace
     - stacktrace/development:
-        # TODO: remove filtering once https://github.com/open-telemetry/opentelemetry-java-contrib/pull/2803 is merged and released
-        filter: co.elastic.otel.SpanStackTraceFilter
 
     # Requires the inferred-spans extension (included in EDOT)
     # https://github.com/open-telemetry/opentelemetry-java-contrib/tree/main/inferred-spans

custom/src/main/resources/co/elastic/otel/config.yaml

@@ -87,6 +87,19 @@ void testDefaults() {
               .inPath("baggage")
               .isObject();
 
+          // stacktrace processor does not have any configuration by default, thus we have to test
+          // for additional
+          // property presence without using json serialization.
+          assertThat(
+                  config
+                      .getTracerProvider()
+                      .getProcessors()
+                      .get(1)
+                      .getAdditionalProperties()
+                      .containsKey("stacktrace/development"))
+              .describedAs("stacktrace processor should be present by default")
+              .isTrue();
+
           assertThatJson(json(config.getTracerProvider().getProcessors().get(2)))
               .inPath("inferred_spans/development")
               .isObject()

custom/src/test/java/co/elastic/otel/SpanStackTraceFilterTest.java

@@ -0,0 +1,9 @@
+prs:
+- https://github.com/elastic/elastic-otel-java/pull/1117
+issues:
+- https://github.com/elastic/elastic-otel-java/issues/1083
+type: enhancement
+products:
+- product: edot-java
+  lifecycle: ga
+title: remove explicit filter to simplify span stacktrace declarative config