Add notes warning against using EDOT SDKs alongside other APM agents (#352)

* Add note warning against using EDOT SDKs alongside other APM agents

Author: alexandra5000

docs/reference/edot-sdks/dotnet/setup/index.md

@@ -30,6 +30,10 @@ This quickstart guide documents the introductory steps required to set up OpenTe
 * [Worker services](/reference/edot-sdks/dotnet/setup/worker-services.md)
 * [Zero code](/reference/edot-sdks/dotnet/setup/zero-code.md)
 
+:::{warning}
+Avoid using the .NET SDK alongside any other APM agent, including Elastic APM agents. Running multiple agents in the same application process may lead to conflicting instrumentation, duplicate telemetry, or other unexpected behavior.
+:::
+
 ### Prerequisites
 
 Before getting started:

docs/reference/edot-sdks/index.md

@@ -47,6 +47,10 @@ This table provides an overview of the features available in the {{edot}} (EDOT)
 
 Elastic provides technical support for EDOT Language SDKs according to Elastic's [Support Policy](https://www.elastic.co/support_policy). EDOT SDKs are meant to be used in combination with the [EDOT Collector](/reference/edot-collector/index.md) or the [{{motlp}}](/reference/motlp.md) to ingest data into Elastic solutions from the EDOT SDKs. Other ingestion paths are not officially supported by Elastic.
 
+:::{warning}
+Avoid using EDOT SDKs alongside any other APM agent, including Elastic APM agents. Running multiple agents in the same application process may lead to conflicting instrumentation, duplicate telemetry, or other unexpected behavior.
+:::
+
 ## License
 
 EDOT SDKs are licensed under the [Apache License, Version 2.0](https://www.apache.org/licenses/LICENSE-2.0).

docs/reference/edot-sdks/java/setup/index.md

@@ -17,6 +17,10 @@ products:
 
 Learn how to set up the {{edot}} (EDOT) Java in various environments, including Kubernetes and others.
 
+:::{warning}
+Avoid using the Java SDK alongside any other APM agent, including Elastic APM agents. Running multiple agents in the same application process may lead to conflicting instrumentation, duplicate telemetry, or other unexpected behavior.
+:::
+
 ## Kubernetes
 
 For Kubernetes, use the OTel Kubernetes Operator. The Operator also manages the auto-instrumentation of Java applications. Follow the [quickstart guide](/reference/quickstart/index.md) for Kubernetes or learn more about [instrumentation details on Kubernetes for Java](/reference/edot-sdks/java/setup/k8s.md).

docs/reference/edot-sdks/nodejs/setup/index.md

@@ -31,6 +31,9 @@ export OTEL_SERVICE_NAME="my-app"
 # Start it with your application
 node --import @elastic/opentelemetry-node my-app.js
 ```
+:::{warning}
+Avoid using the Node.js SDK alongside any other APM agent, including Elastic APM agents. Running multiple agents in the same application process may lead to conflicting instrumentation, duplicate telemetry, or other unexpected behavior.
+:::
 
 If you are deploying in Kubernetes, see the [Kubernetes setup guide](/reference/edot-sdks/nodejs/setup/k8s.md).
 

docs/reference/edot-sdks/php/setup/index.md

@@ -27,6 +27,10 @@ To quickly get up and running, follow the [Elastic OpenTelemetry Quickstart guid
 - Configuring your OpenTelemetry agent.
 - Exploring traces and metrics in {{kib}}.
 
+:::{warning}
+Avoid using the PHP SDK alongside any other APM agent, including Elastic APM agents. Running multiple agents in the same application process may lead to conflicting instrumentation, duplicate telemetry, or other unexpected behavior.
+:::
+
 ### Operating system and PHP version
 
 Refer to [Supported technologies](/reference/edot-sdks/php/supported-technologies.md) for details about currently supported operating systems and PHP versions.

docs/reference/edot-sdks/python/setup/index.md

@@ -19,6 +19,10 @@ Learn how to set up the {{edot}} (EDOT) Python in various environments, includin
 
 Follow these steps to get started.
 
+:::{warning}
+Avoid using the Python SDK alongside any other APM agent, including Elastic APM agents. Running multiple agents in the same application process may lead to conflicting instrumentation, duplicate telemetry, or other unexpected behavior.
+:::
+
 ::::::{stepper}
 
 ::::{step} Install the distribution