Can you enable 'sysctls' to be namespace aware?

Issue

• Are 'sysctls' configurable for each container or pod?
• Some 'sysctls' seem not namespaced so you cannot set in containers or pods.
• I got messages including the following while trying to create a pod or container.

........ 
"write sysctl key net.ipv4.tcp_rmem: open /proc/sys/net/ipv4/tcp_rmem: no such file or directory\""  
.........