feat(devservices): Add instructions to migrate data from old devservices

develop-docs/development-infrastructure/devservices.mdx

@@ -76,3 +76,42 @@ Common modes:
 ```shell
 devservices up --mode symbolicator
 ```
+
+## Migrating data from the deprecated `sentry devservices`
+
+<Alert level="warning" title="Important">
+  These instructions can result in data loss. Please proceed with caution. This is an example with postgres, but can be done with other docker volumes as well.
+</Alert>
+
+Volume names are different for each service.
+
+Clickhouse:
+  - old: `sentry_clickhouse`
+  - new: `snuba_clickhouse-data`
+
+Postgres:
+  - old: `sentry_postgres`
+  - new: `sentry_postgres-data`
+
+Kafka:
+  - old: `sentry_kafka`
+  - new: `kafka_kafka-data`
+
+Redis:
+  - old: `sentry_redis`
+  - new: `redis_redis-data`
+
+```shell
+# Create a new postgres volume
+docker volume create sentry_postgres-data
+
+# Copy over the data from the old volume
+docker run --rm \
+  -v sentry_postgres:/old_volume \
+  -v sentry_postgres-data:/new_volume \
+  ubuntu \
+  bash -c "cd /old_volume && cp -a . /new_volume"
+
+# Validate that data has been copied over
+docker run --rm -v sentry_postgres-data:/data ubuntu ls -l /data
+```