Add missing recommended resource attributes to AWS Lambda detector

CHANGELOG.md

@@ -12,6 +12,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 - Add the new `go.opentelemetry.io/contrib/instrgen` package to provide auto-generated source code instrumentation. (#3068)
 - `otelmux`: Add new `WithSpanNameFormatter` option to `go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux` to allow customizing span names. (#3041)
+- Add missing recommended AWS Lambda resource attributes `faas.instance` and `faas.max_memory` in `go.opentelemetry.io/contrib/detectors/aws/lambda`. (#2333)
 
 ## [1.12.0/0.37.0/0.6.0]
 

detectors/aws/lambda/README.md

@@ -46,6 +46,8 @@ Now your `TracerProvider` will have the following resource attributes and attach
 |`cloud.region` | us-east-1 
 |`faas.name` | MyLambdaFunction 
 |`faas.version` | $LATEST
+|`faas.instance` | 2021/06/28/[$LATEST]2f399eb14537447da05ab2a2e39309de
+|`faas.max_memory`| 128
 
 Of note, `faas.id` and `cloud.account.id` are not set by the Lambda resource detector because they are not available outside a Lambda invocation. For this reason, when using the AWS Lambda Instrumentation these attributes are set as additional span attributes.
 

detectors/aws/lambda/detector.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"errors"
 	"os"
+	"strconv"
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/sdk/resource"
@@ -30,6 +31,8 @@ const (
 	lambdaFunctionNameEnvVar    = "AWS_LAMBDA_FUNCTION_NAME"
 	awsRegionEnvVar             = "AWS_REGION"
 	lambdaFunctionVersionEnvVar = "AWS_LAMBDA_FUNCTION_VERSION"
+	lambdaLogStreamNameEnvVar   = "AWS_LAMBDA_LOG_STREAM_NAME"
+	lambdaMemoryLimitEnvVar     = "AWS_LAMBDA_FUNCTION_MEMORY_SIZE"
 )
 
 var (
@@ -57,13 +60,23 @@ func (detector *resourceDetector) Detect(context.Context) (*resource.Resource, e
 	}
 	awsRegion := os.Getenv(awsRegionEnvVar)
 	functionVersion := os.Getenv(lambdaFunctionVersionEnvVar)
+	// The instance attributes corresponds to the log stream name for AWS lambda,
+	// see the FaaS resource specification for more details.
+	instance := os.Getenv(lambdaLogStreamNameEnvVar)
 
 	attrs := []attribute.KeyValue{
 		semconv.CloudProviderAWS,
 		semconv.CloudRegionKey.String(awsRegion),
+		semconv.FaaSInstanceKey.String(instance),
 		semconv.FaaSNameKey.String(lambdaName),
 		semconv.FaaSVersionKey.String(functionVersion),
 	}
 
+	maxMemoryStr := os.Getenv(lambdaMemoryLimitEnvVar)
+	maxMemory, err := strconv.Atoi(maxMemoryStr)
+	if err == nil {
+		attrs = append(attrs, semconv.FaaSMaxMemoryKey.Int(maxMemory))
+	}
+
 	return resource.NewWithAttributes(semconv.SchemaURL, attrs...), nil
 }

detectors/aws/lambda/detector_test.go

@@ -32,12 +32,16 @@ func TestDetectSuccess(t *testing.T) {
 	_ = os.Setenv(lambdaFunctionNameEnvVar, "testFunction")
 	_ = os.Setenv(awsRegionEnvVar, "us-texas-1")
 	_ = os.Setenv(lambdaFunctionVersionEnvVar, "$LATEST")
+	_ = os.Setenv(lambdaLogStreamNameEnvVar, "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc")
+	_ = os.Setenv(lambdaMemoryLimitEnvVar, "128")
 
 	attributes := []attribute.KeyValue{
 		semconv.CloudProviderAWS,
 		semconv.CloudRegionKey.String("us-texas-1"),
 		semconv.FaaSNameKey.String("testFunction"),
 		semconv.FaaSVersionKey.String("$LATEST"),
+		semconv.FaaSInstanceKey.String("2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc"),
+		semconv.FaaSMaxMemoryKey.Int(128),
 	}
 	expectedResource := resource.NewWithAttributes(semconv.SchemaURL, attributes...)
 	detector := resourceDetector{}

instrumentation/github.com/aws/aws-lambda-go/otellambda/lambda_test.go

@@ -54,6 +54,8 @@ func setEnvVars() {
 	_ = os.Setenv("AWS_LAMBDA_FUNCTION_NAME", "testFunction")
 	_ = os.Setenv("AWS_REGION", "us-texas-1")
 	_ = os.Setenv("AWS_LAMBDA_FUNCTION_VERSION", "$LATEST")
+	_ = os.Setenv("AWS_LAMBDA_LOG_STREAM_NAME", "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc")
+	_ = os.Setenv("AWS_LAMBDA_FUNCTION_MEMORY_SIZE", "128")
 	_ = os.Setenv("_X_AMZN_TRACE_ID", "Root=1-5759e988-bd862e3fe1be46a994272793;Parent=53995c3f42cd8ad8;Sampled=1")
 }
 

instrumentation/github.com/aws/aws-lambda-go/otellambda/test/lambda_test.go

@@ -102,6 +102,8 @@ func setEnvVars() {
 	_ = os.Setenv("AWS_LAMBDA_FUNCTION_NAME", "testFunction")
 	_ = os.Setenv("AWS_REGION", "us-texas-1")
 	_ = os.Setenv("AWS_LAMBDA_FUNCTION_VERSION", "$LATEST")
+	_ = os.Setenv("AWS_LAMBDA_LOG_STREAM_NAME", "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc")
+	_ = os.Setenv("AWS_LAMBDA_FUNCTION_MEMORY_SIZE", "128")
 	_ = os.Setenv("_X_AMZN_TRACE_ID", "Root=1-5759e988-bd862e3fe1be46a994272793;Parent=53995c3f42cd8ad8;Sampled=1")
 }
 
@@ -148,7 +150,9 @@ var (
 			attribute.String("cloud.provider", "aws"),
 			attribute.String("cloud.region", "us-texas-1"),
 			attribute.String("faas.name", "testFunction"),
-			attribute.String("faas.version", "$LATEST")),
+			attribute.String("faas.version", "$LATEST"),
+			attribute.String("faas.instance", "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc"),
+			attribute.Int("faas.max_memory", 128)),
 		InstrumentationLibrary: instrumentation.Library{Name: "go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-lambda-go/otellambda", Version: otellambda.SemVersion()},
 	}
 )
@@ -336,7 +340,9 @@ var (
 			attribute.String("cloud.provider", "aws"),
 			attribute.String("cloud.region", "us-texas-1"),
 			attribute.String("faas.name", "testFunction"),
-			attribute.String("faas.version", "$LATEST")),
+			attribute.String("faas.version", "$LATEST"),
+			attribute.String("faas.instance", "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc"),
+			attribute.Int("faas.max_memory", 128)),
 		InstrumentationLibrary: instrumentation.Library{Name: "go.opentelemetry.io/contrib/instrumentation/github.com/aws/aws-lambda-go/otellambda", Version: otellambda.SemVersion()},
 	}
 )

instrumentation/github.com/aws/aws-lambda-go/otellambda/xrayconfig/xrayconfig_test.go

@@ -67,6 +67,8 @@ func setEnvVars() {
 	_ = os.Setenv("AWS_LAMBDA_FUNCTION_NAME", "testFunction")
 	_ = os.Setenv("AWS_REGION", "us-texas-1")
 	_ = os.Setenv("AWS_LAMBDA_FUNCTION_VERSION", "$LATEST")
+	_ = os.Setenv("AWS_LAMBDA_LOG_STREAM_NAME", "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc")
+	_ = os.Setenv("AWS_LAMBDA_FUNCTION_MEMORY_SIZE", "128")
 	_ = os.Setenv("_X_AMZN_TRACE_ID", "Root=1-5759e988-bd862e3fe1be46a994272793;Parent=53995c3f42cd8ad8;Sampled=1")
 
 	// fix issue: "The requested service provider could not be loaded or initialized."
@@ -116,6 +118,8 @@ var (
 	expectedSpanResource = v1resource.Resource{
 		Attributes: []*v1common.KeyValue{{Key: "cloud.provider", Value: &v1common.AnyValue{Value: &v1common.AnyValue_StringValue{StringValue: "aws"}}},
 			{Key: "cloud.region", Value: &v1common.AnyValue{Value: &v1common.AnyValue_StringValue{StringValue: "us-texas-1"}}},
+			{Key: "faas.instance", Value: &v1common.AnyValue{Value: &v1common.AnyValue_StringValue{StringValue: "2023/01/01/[$LATEST]5d1edb9e525d486696cf01a3503487bc"}}},
+			{Key: "faas.max_memory", Value: &v1common.AnyValue{Value: &v1common.AnyValue_IntValue{IntValue: 128}}},
 			{Key: "faas.name", Value: &v1common.AnyValue{Value: &v1common.AnyValue_StringValue{StringValue: "testFunction"}}},
 			{Key: "faas.version", Value: &v1common.AnyValue{Value: &v1common.AnyValue_StringValue{StringValue: "$LATEST"}}}},
 		DroppedAttributesCount: 0,
@@ -129,11 +133,13 @@ var (
 )
 
 func assertResourceEquals(t *testing.T, expected *v1resource.Resource, actual *v1resource.Resource) {
-	assert.Len(t, actual.Attributes, 4)
+	assert.Len(t, actual.Attributes, 6)
 	assert.Equal(t, expected.Attributes[0].String(), actual.Attributes[0].String())
 	assert.Equal(t, expected.Attributes[1].String(), actual.Attributes[1].String())
 	assert.Equal(t, expected.Attributes[2].String(), actual.Attributes[2].String())
 	assert.Equal(t, expected.Attributes[3].String(), actual.Attributes[3].String())
+	assert.Equal(t, expected.Attributes[4].String(), actual.Attributes[4].String())
+	assert.Equal(t, expected.Attributes[5].String(), actual.Attributes[5].String())
 	assert.Equal(t, expected.DroppedAttributesCount, actual.DroppedAttributesCount)
 }