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docs: add a para about random selection of read replicas

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PR-URL: https://github.com/hasura/graphql-engine-mono/pull/10807
GitOrigin-RevId: 986ccc2114e5dc4b67048091cc8358058b4a60e8
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Anon Ray 2024-05-08 17:52:13 +05:30 committed by hasura-bot
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docs/docs/databases/database-config/read-replicas.mdx
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@ -29,6 +29,11 @@ import ProductBadge from '@site/src/components/ProductBadge';
Hasura Cloud and Hasura Enterprise can route queries and subscriptions across _read replicas_ while sending all
mutations and Metadata API calls to the primary.
This works by selecting a read replica instance at random. Hasura does not
perform any kind of load balancing across the replicas. The random function used
has a uniform distribution, and so over time, queries will distribute uniformly
across all replica instances.
## Adding read replica URLs
### Postgres