v1.2.0

Release v1.2.0 for CDK AWS Observability Accelerator.

Notable feature additions :

• Pattern for NGINX Monitoring
• Pattern for Apiserver monitoring
• GPU Opensource Observability Pattern
• Multi Cluster Multi Account Multi Region Observability Pattern
• Logging Pattern
• Documentation Pages Revamp

Contributors : @elamaran11, @freschri, @joozero, @naveen-bathula, @nrajb, @lewinkedrs

Thanks to first time contributors : @joozero