Renaming to otel-instrument and default configs (#956)

lambda-layer/build-layer.sh

@@ -45,4 +45,4 @@ popd
 
 ## Copy ADOT Java Agent downloaded using Gradle task and bundle it with the Lambda handler script
 cp "$SOURCEDIR"/build/javaagent/aws-opentelemetry-agent*.jar ./opentelemetry-javaagent.jar
-zip -qr opentelemetry-javaagent-layer.zip opentelemetry-javaagent.jar otel-handler
+zip -qr opentelemetry-javaagent-layer.zip opentelemetry-javaagent.jar otel-instrument

lambda-layer/otel-instrument

@@ -0,0 +1,38 @@
+#!/bin/bash
+
+export OTEL_INSTRUMENTATION_AWS_SDK_EXPERIMENTAL_SPAN_ATTRIBUTES=true
+
+export OTEL_PROPAGATORS="${OTEL_PROPAGATORS:-xray,tracecontext,b3,b3multi}"
+
+export OTEL_SERVICE_NAME=${OTEL_SERVICE_NAME:-${AWS_LAMBDA_FUNCTION_NAME}}
+
+export JAVA_TOOL_OPTIONS="-javaagent:/opt/opentelemetry-javaagent.jar ${JAVA_TOOL_OPTIONS}"
+
+if [[ $OTEL_RESOURCE_ATTRIBUTES != *"service.name="* ]]; then
+  export OTEL_RESOURCE_ATTRIBUTES="service.name=${AWS_LAMBDA_FUNCTION_NAME},${OTEL_RESOURCE_ATTRIBUTES}"
+fi
+
+export OTEL_INSTRUMENTATION_AWS_LAMBDA_FLUSH_TIMEOUT=10000
+
+# Disable the Application Signals runtime metrics since we are on Lambda
+export OTEL_AWS_APPLICATION_SIGNALS_RUNTIME_ENABLED=false
+
+# Use OTLP traces exporter if not specified
+export OTEL_TRACES_EXPORTER=${OTEL_TRACES_EXPORTER:-"otlp"}
+
+# Disable metrics and logs export by default if not specified
+export OTEL_METRICS_EXPORTER=${OTEL_METRICS_EXPORTER:-"none"}
+export OTEL_LOGS_EXPORTER=${OTEL_LOGS_EXPORTER:-"none"}
+
+# Enable Application Signals by default if not specified
+export OTEL_AWS_APPLICATION_SIGNALS_ENABLED=${OTEL_AWS_APPLICATION_SIGNALS_ENABLED:-"true"}
+
+# Append Lambda Resource Attributes to OTel Resource Attribute List
+LAMBDA_RESOURCE_ATTRIBUTES="cloud.region=$AWS_REGION,cloud.provider=aws,faas.name=$AWS_LAMBDA_FUNCTION_NAME,faas.version=$AWS_LAMBDA_FUNCTION_VERSION,faas.instance=$AWS_LAMBDA_LOG_STREAM_NAME,aws.log.group.names=$AWS_LAMBDA_LOG_GROUP_NAME";
+if [ -z "${OTEL_RESOURCE_ATTRIBUTES}" ]; then
+    export OTEL_RESOURCE_ATTRIBUTES=$LAMBDA_RESOURCE_ATTRIBUTES;
+else
+    export OTEL_RESOURCE_ATTRIBUTES="$LAMBDA_RESOURCE_ATTRIBUTES,$OTEL_RESOURCE_ATTRIBUTES";
+fi
+
+exec "$@"