Horizontal read scaling

[atovpeko]

Closes https://linear.app/timescale/issue/ORC-2/docs

[github-actions]

Allow 10 minutes from last push for the staging site to build. If the link doesn't work, try using incognito mode instead. For internal reviewers, check web-documentation repo actions for staging build status. Link to build for this PR: http://docs-dev.timescale.com/docs-297-docs-rfc-new-docs-for-load-balancing-horizontal-scaling

[billy-the-fish]

Few small nits. Good doc.

[ramonguiu]

I'll review in more detail but some high level feedback:

• I am not sure I would keep HA and Read Replicas in the same section. While replication is the technical solution for both, they are very different JTBD (jobs to be done). I would consider using Read scaling in the title instead of read replication.
• The name of the feature now is “read replica set” , not read replica.
• We have to mention horizontal scaling in the content.

[atovpeko]

Hi @ramonguiu, thank you for reviewing! To address your comments:

• I have renamed the page as requested and mentioned horizontal scaling front and center.
• This page will go under a big "Operate and scale" section during the upcoming doc restructure, so it won't be grouped with HA.
• At the time of writing this, the designs still used both terms - read replica and read replica set - so I stuck to the old one. Updated now.
• Waiting when this is on dev to update the workflow, this is very outdated now. Will be happy to get your detailed review then.

[ramonguiu]

I think we could add an architecture diagram to better illustrate the solution. There is one in the blog post (not sure if it's final): https://docs-dev.timescale.com/docs-297-docs-rfc-new-docs-for-load-balancing-horizontal-scaling/use-timescale/297-docs-rfc-new-docs-for-load-balancing-horizontal-scaling/ha-replicas/read-scaling/