Cause: In scaled application, the HAProxy cartridge in head gear contains a ssh wrapper that is set to quiet mode (-q flag).
Consequence: As a result, if user executes ssh commands with invalid parameters, no errors are shown as they are suppressed by the -q flag.
Fix: The ssh wrapper in HAProxy cartridge is removed as it's no longer needed. The oo-ssh now exists and the node runtime either uses it or specifies the required flags wherever it invokes ssh commands. As a result, ssh in head gear will use standard ssh from /usr/bin/ssh which doesn't have -q flag.
Result: If an invalid ssh command is executed, the meaningful error message will be prompted to the user.