SDP Local Monitoring and Control v0.21.0

Summary

Added

• controller device monitors SDP components and reports their status on the "components" attribute
• controller device updates its healthState attribute based on component statuses
• code to support kubernetes liveness probes has been added

Changed

• SDP LMC has been upgraded to use pytango 9.3.6
• use ska-sdp-config 0.4.4

Fixed

• Subarray device handles missing execution block case