[8.x] Add placeholder for 'transform to OTel Collector' docs (backport #1550) (#1559)

* Add placeholder for 'transform to OTel Collector' docs (#1550)

* Add placeholder for 'transform to OTel Collector' docs

* Add include statement (commented out)

* Update docs/en/ingest-management/elastic-agent/otel-agent-transform.asciidoc

Co-authored-by: shainaraskas <[email protected]>

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Co-authored-by: shainaraskas <[email protected]>
(cherry picked from commit 6d32677)

* Update otel-agent-transform.asciidoc

* Update index.asciidoc

* Update otel-agent.asciidoc

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Co-authored-by: David Kilfoyle <[email protected]>

Author: mergify[bot]

docs/en/ingest-management/elastic-agent/otel-agent-transform.asciidoc

@@ -78,4 +78,4 @@ The OTel Collector running configuration should appear under `elastic-agent` key
 ----
 +
 . Congratulations! Host logs and metrics are now being collected and ingested by the {agent} service running an OTel Collector instance.
-For further details about OpenTelemetry collector components supported by {agent}, refer to the link:https://github.com/elastic/elastic-agent/tree/main/internal/pkg/otel#components[Elastic Distribution for OpenTelemetry Collector README].
+For further details about OpenTelemetry collector components supported by {agent}, refer to the link:https://github.com/elastic/elastic-agent/tree/main/internal/pkg/otel#components[Elastic Distribution for OpenTelemetry Collector README].

docs/en/ingest-management/elastic-agent/otel-agent.asciidoc

@@ -8,3 +8,5 @@ The link:https://opentelemetry.io/docs/collector/[OpenTelemetry Collector] is a
 When you run {agent} in `otel` mode it supports the standard OTel Collector configuration format that defines a set of receivers, processors, exporters, and connectors. Logs, metrics, and traces can be ingested using OpenTelemetry data formats.
 
 For a full overview and steps to configure {agent} in `otel` mode, including a guided onboarding, refer to the link:https://github.com/elastic/opentelemetry/tree/main[Elastic Distributions for OpenTelemetry] repository in GitHub. You can also check the <<elastic-agent-otel-command,`elastic-agent otel` command>> in the {fleet} and {agent} Command reference.
+
+If you have a currently running {agent} you can <<otel-agent-transform,transform it to run as an OTel Collector>>.

docs/en/ingest-management/index.asciidoc

@@ -71,6 +71,8 @@ include::elastic-agent/configuration/env/container-envs.asciidoc[leveloffset=+3]
 
 include::elastic-agent/otel-agent.asciidoc[leveloffset=+2]
 
+include::elastic-agent/otel-agent-transform.asciidoc[leveloffset=+2]
+
 include::elastic-agent/elastic-agent-unprivileged-mode.asciidoc[leveloffset=+2]
 
 include::elastic-agent/install-agent-msi.asciidoc[leveloffset=+2]