Agent Manager crashes without any erros in the log files. In the Linux log files (/var/logs/messages) the following can be found:
A Linux system that runs out of memory kills automatically processes (OOM killer). Here it kills the Foglight Agent Manager (FglAM) process, but that does not mean that the FglAM is the root cause of the issue. It might be the amount of processes with makes the machine to run out of memory.
Please consult your Linux administrators.