Branch 3.9.0

New in 3.9.0

• keyspace/table dashboard #998
• remove the ad-hoc filter #1531
• Add 4.6 support #1526
• Make the per-DC node table larger #1522
• Add alermanager persistant storage #1517
• Update grafana to 8.1.1 #1515
• Change to the core pie-chart panel and remove the plugin #1511
• start-all.sh unexpected hyphen #1507
• Remove the per version templates and the generated dashboards from master #1489
• reads/writes help should states that it's attempts #1486
• Docs: Add an overview section, including high level architecture diagram #1471
• Improve UX for node info #1465
• Move to grafana 8 #1428
• Remove the current_version from git master #1332
• Switch to the new time series panel enhancement #1322
• The -l option of start_all.sh is undiscoverable and better be automatic #1098
• Add an optional external directory for Loki
• Deprecate -v latest command line option
• Add a per-container limits configuration (--limit flag)
• Add per-container value mapping (--volume)
• Add per-container command line parameter configuration (--param)