Add "s3/"-prefix to S3 destination.service.resource

closes elastic#1717

CHANGELOG.asciidoc

@@ -43,7 +43,14 @@ endif::[]
 * Fix spans being dropped if they don't have a name {pull}1770[#1770]
 * Fix AWS Lambda support when `event` is not a dict {pull}1775[#1775]
 * Fix deprecation warning with urllib3 2.0.0 pre-release versions {pull}1778[#1778]
-
+* Fix span.context.destination.service.resource for S3 spans to have an "s3/" prefix. {pull}x[#x]
++
+*Note*: While this is considered a bugfix, it can potentially be a breaking
+change in the Kibana APM app: It can break the history of the S3-Spans / metrics
+for users relying on `context.destination.service.resource`. If users happen to
+run agents both with and without this fix (for same or different languages), the
+same S3-buckets can appear twice in the service map (with and without
+s3-prefix).
 
 
 [[release-notes-6.x]]

elasticapm/instrumentation/packages/botocore.py

@@ -123,7 +123,7 @@ def handle_s3(operation_name, service, instance, args, kwargs, context):
         bucket = ""
     signature = f"S3 {operation_name} {bucket}"
 
-    context["destination"]["service"] = {"name": span_subtype, "resource": bucket, "type": span_type}
+    context["destination"]["service"] = {"name": span_subtype, "resource": f"s3/{bucket}", "type": span_type}
 
     return HandlerInfo(signature, span_type, span_subtype, span_action, context)
 

tests/instrumentation/botocore_tests.py

@@ -116,7 +116,7 @@ def test_s3(instrument, elasticapm_client):
         assert span["context"]["destination"]["port"] == LOCALSTACK_ENDPOINT_URL.port
         assert span["context"]["destination"]["cloud"]["region"] == "us-east-1"
         assert span["context"]["destination"]["service"]["name"] == "s3"
-        assert span["context"]["destination"]["service"]["resource"] == "xyz"
+        assert span["context"]["destination"]["service"]["resource"] == "s3/xyz"
         assert span["context"]["destination"]["service"]["type"] == "storage"
         assert span["context"]["http"]["request"]["id"]
     assert spans[0]["name"] == "S3 CreateBucket xyz"