dashboards release v4.19.0

Changed

• Updated Tempo dashboards to mixins v2.10
• bugfixes in Tempo operational dashboard
• Update Network Traffic Analysis Overview dashboard
  • Replace average network traffic gauges with total data transfer bar chart
  • Add a time period selector for data transfer periods
  • Make total visible in all panels
  • Remove datasource variable
  • Simplify traffic rate queries

Removed

• Remove the object-storage-operator