v1.28.0

What's Changed

• Update golangci-lint by @julienduchesne in #606
• Datasource: Arbitrary JSON Data by @julienduchesne in #607
• Datasources: Support reading data from Grafana API by @julienduchesne in #609
• Trim whitespace on alerting_message_template.template by @inkel in #611
• Cloud Stack: Add traces and graphite attributes by @julienduchesne in #612
• OnCall: Use ReadContext instead of Read by @julienduchesne in #614
• Validate that clients exist in all resources by @julienduchesne in #613
• Validate that clients exist in all resources by @julienduchesne in #615
• Add subcategories to docs by @julienduchesne in #617
• fix: Do not error out when removing deleted users from teams by @julienduchesne in #620

Full Changelog: v1.27.0...v1.28.0