Point to in-depth Kafka guide (#13857)

The internal document has a lot more details than what I added.

Author: armenzg

develop-docs/backend/application-domains/kafka.mdx

@@ -3,36 +3,4 @@ title: Kafka consumers
 sidebar_order: 60
 ---
 
-## Create a new Kafka topic
-
-1. Add the topic to the `KAFKA_TOPIC_TO_CLUSTER` in [src/sentry/conf/server.py](https://github.com/getsentry/sentry/blob/master/src/sentry/conf/server.py):
-  * e.g. `subscription-results-eap-items`
-2. Add the topic to `Topic` in [src/sentry/conf/types/kafka_definition.py](https://github.com/getsentry/sentry/blob/master/src/sentry/conf/types/kafka_definition.py)
-
-## Define or re-use a processing strategy
-
-In most cases a [Streaming Factory](https://getsentry.github.io/arroyo/getstarted.html#create-a-streaming-consumer) is what you want to when defining a consumer (see next section). You can find examples of it in [Sentry's code base](https://github.com/search?q=repo%3Agetsentry%2Fsentry+%28ProcessingStrategyFactory&type=code).
-
-## Define a new Kafka consumer
-
-1. Add a new entry in the `KAFKA_CONSUMERS` key in
-   [src/sentry/consumers/__init__.py](https://github.com/getsentry/sentry/blob/master/src/sentry/consumers/__init__.py):
-```python
-KAFKA_CONSUMERS = {
-    "<your_topic_str_here>": {
-        "topic": Topic.YOUR_TOPIC,
-        "strategy_factory": "sentry_package_defining_your_strategy_factory_class",
-    }
-}
-```
-2. You may need optional properties (e.g. `click_options`, you will need to research them by looking at [ConsumerDefinition](https://github.com/getsentry/sentry/blob/master/src/sentry/conf/types/kafka_definition.py)'s code.
-
-3. Make sure you can run it: `sentry run consumer <your_topic>`
-4. You may need to add some devserver options [here](https://github.com/getsentry/sentry/blob/master/src/sentry/runner/commands/devserver.py).
-4. Add tests for your consumer
-
-## Run the consumer in production
-1. Discuss it with SRE during their office  hours
-2. Create ops PR for adding your consumer to
-   [k8s/services/getsentry/_consumer-deployment.yaml.j2](https://github.com/getsentry/ops/blob/master/k8s/services/getsentry/_consumer-deployment.yaml.j2).
-3. In the [Sentry Consumers metrics dashboard](https://www.notion.so/sentry/Kafka-e8b4f93595684c97b01fe831fbceb0dc?pvs=4#1fa8b10e4b5d8044859ecaf559463cb0), add a new saved view for your consumer.
+Visit https://github.com/getsentry/ops/tree/master/shared_config/kafka for a full, in-depth step-by-step guide.