CONFIG_HEARTBEAT is not available for the selected architecture x86.
Result is shown for architecture m68k

Use power LED as a heartbeat

modulename: heartbeat.ko

configname: CONFIG_HEARTBEAT

Linux Kernel Configuration
└─>Platform devices
└─>Use power LED as a heartbeat
In linux kernel since version 2.6.12 )
Use the power-on LED on your machine as a load meter. The exact
behavior is platform-dependent, but normally the flash frequency is
a hyperbolic function of the 5-minute load average.
depends
CONFIG_MMU