We have in code:

fmd_hdl_debug(hdl, "Crash dump instance %ld\\n",
	    cdp->scd_panic_instance);

But these won't be visible unless you fmd in debug mode.

Steps below provide example how to enable debug output.

Disable fmd service:

svcadm disable fmd

Run fmd in foreground with debug prints:

/usr/lib/fm/fmd/fmd -o fg=true -o client.debug=true

Run in foreground with all debug info:

/usr/lib/fm/fmd/fmd -o fg=true -o client.debug=true -o debug=all

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