3.6.0: `block_builder` config item causes startup errors

[agross]

Describe the bug

block_builder:
  max_chunk_age: 18000h

failed parsing config: /etc/loki/local-config.yaml: yaml: unmarshal errors:
  line 3: field block_builder not found in type loki.ConfigWrapper. Use `-config.expand-env=true` flag if you want to expand environment variables in your config file

To Reproduce Steps to reproduce the behavior:

1. Start Loki 3.6.0 with the config above that worked in 3.5.8
2. Expected to find something causing this in the release notes, but didn’t
3. Expected to find 3.6.x docs, but didn't

Expected behavior

3.6.0 works like 3.5.8

Environment:

• Infrastructure: docker
• Deployment tool: docker compose

[leinardi]

Same here, breaking changes like this should be reserved to new major releases and not minor like going form 3.5.x to 3.6.x.

[agross]

@leinardi Do you know a workaround or 3.6 alternative to this setting?

[leinardi]

Unfortunately not, I just commented the entire block for now.