We just published patch release for version 4.0 (4.0.2148). Changes since previous release:

• New attribute "lastCollectionTime" in NXSL class "DCI"
• Notification channel driver for Twilio
• Fixed server crash on receiving SNMP trap if configuration parameter SNMP.Traps.LogAll is set to true
• Fixed bug in automatic object binding
• Fixed bug in NXSL function FormatMetricPrefix
• Fixed bug in business service state calculation
• Fixed incorrect handling of manually set Y axis range on bar charts
• Fixed issues:
          NX-2153 (Add REST API endpoint for persistent storage)
          NX-2198 (Alternative data source for agent parameters Hardware.System.* on Linux)
          NX-2209 (cpuid.h is not supported on ARM macOS)

Best regards,
Victor