[Bro] did my signature in site loaded?

[Ong hean kuan]

I am a new user here, I have doubt.

I have a signature.sig in site folder and my site/mydomain.bro looks as
bellow,

# Make any changes to policy starting HERE:

# To run signatures, uncomment the following line.
# @load brolite-sigs

@ifdef ( use_signatures )
        # Load Bro signatures.  This is the default file containing Bro
        # signatures.
        redef signature_files += "signatures";
@endif

Did my signature loaded? it seems that # @load brolite-sigs is commented
How to ensure which signature is loaded and which is not?
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