The jsonnet doesn't seem suitable for multi-store configuration

[umezawatakeshi]

Describe the bug

The jsonnet always outputs .compactor.shared_store field in ConfigMap if boltdb_shipper and/or tsdb_shipper are used.
cf. https://github.com/grafana/loki/blob/v2.9.3/production/ksonnet/loki/shipper.libsonnet#L43

According to https://grafana.com/docs/loki/latest/setup/upgrade/#compactor-multi-store-support , .compactor.shared_store should not be configured for multi-store configuration to perform compaction on all stores.

I already have used Loki with multi-store configuration. Several days before, I noticed that the compaction hadn't been performed since I had upgraded Loki to 2.9.1 because the compactor tried to perform compaction on the latest period store but it only knew the way to perform compaction on the store in .compactor.shared_store.

To Reproduce

Expected behavior

I want a some option(s) for multi-store configuration.

Environment:

• Deployment tool: jsonnet
• Loki version: 2.9.1. But 2.9.3 seems to have the same behavior.

Screenshots, Promtail config, or terminal output
none