Create limit.md

ec2/limit.md

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+# Known issues
+
+## No memory usage in native monitoring
+- every other third-party solution does this out of the box. 
+- Azure and GCP respective monitoring agents also do this.
+
+## [No free public ip after launched](https://serverfault.com/questions/706560/assign-public-ip-not-elastic-ip-after-instance-launched)
+- The instance that you launched without a public IP will stay without one as it is only assignable when you launch the instance. 
+- Even having a subnet with auto assign public IP switched on will not assign a public IP to your instance if not specified when you launch
+
+## Not Serial Connect available without Nitro