feat: release 4.0.0

[lukeskywlkr]

This update is a major version that adds support for the Kubernetes version 1.30 and 1.31. It also introduces a breaking change with the new time series database for Loki TSDB along with the new v13 schema. These changes will improve efficiency, speed and scalability of Loki clusters. The logging-operator, opensearch, opensearch-dashboards and minio-ha have also been updated. Below there are some examples:

Checklist for Testing 🧪

• Tested new Loki installation
• Tested reading old logs with old format from S3 compatible storage
• Verified that changing the TSDB schema on the current date on an existing storage will make the current day work only with the new tsdb storage
• Tested migration to opensearch
• Tested opensearch index patterns
• Tested migration from opensearch to loki

Details ⚙️

• Added support for Kubernetes version 1.30 and 1.31

• New schema and store for Loki: The Loki configuration has been extended to add the new TSDB store and v13 schema. There are two new elements in the configuration (note: this is a breaking change):

  ...
  schema_config:
    ...
    - from: "2024-12-01"
      index:
        period: 24h
        prefix: index_
      object_store: s3
      schema: v13
      store: tsdb
  ...
  storage_config:
    ...
    tsdb_shipper:
      active_index_directory: /var/loki/index
      cache_location: /var/loki/cache
      cache_ttl: 24h
      resync_interval: 5s
      shared_store: s3

  The two pieces of new configuration introduced are:

  • The new schema config with TSDB and schema v13
  • The tsdb_shipper conf that configures the storage for TSDB

  The from in schema_config should be a string in ISO 8601 date format and it represents the day starting from which Loki will record logs with the new store and schema.

  ℹ️ Note: Loki will assume the start of the day on the UTC midnight of the specified day.

Breaking Changes 💔

• Loki store and schema change:
  A new store and schema has been introduced in order to improve efficiency, speed and scalability of Loki clusters.

Distribution Related PR 📦

The related feature branch on the distribution is sighupio/fury-distribution#306