ASM detected possible Detection Evasion and HTTP Command injection in traffic

Those are part of your ASM security policy. Whether or not it was blocked would be based on your settings. You can read more about attack signatures and evasion settings here:

https://support.f5.com/kb/en-us/products/big-ip_asm/manuals/product/asm-implementations-13-0-0/26.html

or here:

https://support.f5.com/kb/en-us/products/big-ip_asm/manuals/product/f5-asm-operations-guide.pdf

Basically ASM is reporting that someone tried to attack your web infrastructure and tried to do it in such a way that they would slip past a web application firewall. Normally this is done by encoding a string multiple times.