[docs] update roadmap document (#9899)

This document now contains the current focus of the maintainers of the
collector project.

---------

Signed-off-by: Alex Boten <[email protected]>
Co-authored-by: Pablo Baeyens <[email protected]>

Author: codeboten

docs/ga-roadmap.md

@@ -1 +1,57 @@
 # Collector v1 Roadmap
+
+This document contains the roadmap for the Collector. The main goal of this roadmap is to provide clarity on the areas of focus in order to release a v1 of the Collector.
+
+## Proposal
+
+The proposed approach to delivering a stable release of the OpenTelemetry Collector is to produce a distribution of the Collector that contains a minimum set of components which have been stabilized. By doing so, the project contributors will ensure dependencies of those components have also been released under a stable version.
+
+The proposed distribution is set to include the following components only:
+
+- OTLP receiver
+- OTLP exporter
+- OTLP HTTP exporter
+
+These modules depend on a list of other modules, the full list is available in issue [#9375](https://github.com/open-telemetry/opentelemetry-collector/issues/9375).
+
+All stabilized modules will conform to the API expectations outlined in the [VERSIONING.md](../VERSIONING.md) document.
+
+## Out of scope
+
+Explicitly, the following are not in the scope of v1 for the purposes of this document:
+
+* stabilization of additional components/APIs needed by distribution maintainers. Vendors are not the audience
+* Collector Builder
+* telemetrygen
+* mdatagen
+* Operator
+
+Those components are free to pursue v1 at their own pace and may be the focus of future stability work.
+
+## Additional Requirements
+
+The following is a list of requirements for this minimal Collector distribution to be deemed as 1.0:
+
+* The Collector must be observable
+  * Metrics and traces should be produced for data in the hot path
+  * Metrics should be documented in the end-user documentation
+  * Metrics, or a subset of them, should be marked as stable in the documentation
+  * Logs should be produced for Collector lifecycle events
+  * Stability expectations and lifecycle for telemetry should be documented, so that users can know what they can rely on  for their dashboards and alerts
+* The Collector must be scalable
+  * Backpressure from the exporter all the way back to the receiver should be supported
+  * Queueing must be supported to handle increased loads
+  * Performance metrics are in place and follow best practices for benchmarking
+  * Individual components must:
+    * Have their lifecycle expectations enshrined in tests
+    * Have goleak enabled
+* End-user documentation should be provided as part of the official project’s documentation under opentelemetry.io, including:
+  * Getting started with the Collector
+  * Available (stable) components and how to use them
+  * Blueprints for common use cases
+  * Error scenarios and error propagation
+  * Troubleshooting and how to obtain telemetry from the Collector for the purposes of bug reporting
+  * Queueing, batching, and handling of backpressure
+* The Collector must be supported
+  * Processes, workflows and expectations regarding support, bug reporting and questions should be documented.
+  * A minimum support period for 1.0 is documented, similarly to [API and SDK](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/versioning-and-stability.md#api-support) stability guarantees.