#### Description Now that [4246](https://github.com/open-telemetry/opentelemetry.io/pull/4246), [4322](https://github.com/open-telemetry/opentelemetry.io/pull/4322), and [4529](https://github.com/open-telemetry/opentelemetry.io/pull/4529) have been merged, and the new [Internal telemetry](https://opentelemetry.io/docs/collector/internal-telemetry/) and [Troubleshooting](https://opentelemetry.io/docs/collector/troubleshooting/) pages are live, it's time to clean up the underlying Collector repo docs so that the website is the single source of truth. I've deleted any content that was moved to the website, and linked to the relevant sections where possible. I've consolidated what content remains in the observability.md file and left troubleshooting.md and monitoring.md as stubs that point to the website. I also searched the Collector repo for cross-references to these files and adjusted links where appropriate. ~~Note that this PR is blocked by [4731](https://github.com/open-telemetry/opentelemetry.io/pull/4731).~~ EDIT: #4731 is merged and no longer a blocker. <!-- Issue number if applicable --> #### Link to tracking issue Fixes #8886
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OpenTelemetry Collector Long-term Vision
The following are high-level items that define our long-term vision for OpenTelemetry Collector, what we aspire to achieve. This vision is our daily guidance when we design new features and make changes to the Collector.
This is a living document that is expected to evolve over time.
Performant
Highly stable and performant under varying loads. Well-behaved under extreme load, with predictable, low resource consumption.
Observable
Expose own operational metrics in a clear way. Be an exemplar of observable service. Allow configuring the level of observability (more or less metrics, traces, logs, etc reported). See more details.
Multi-Data
Support traces, metrics, logs and other relevant data types.
Usable Out of the Box
Reasonable default configuration, supports popular protocols, runs and collects out of the box.
Extensible
Extensible and customizable without touching the core code. Can create custom agents based on the core and extend with own components. Welcoming 3rd party contribution policy.
Unified Codebase
One codebase for daemon (Agent) and standalone service (Collector).