Please note that the install of these monitoring tools comes in the form of a FreeBSD package. Right now I don't have the opportunity to check whether this package has been verified/approved by a FreeBSD ports committer.
From
pkg_add(1):
Code:
WARNING
Since the pkg_add command may execute scripts or programs contained
within a package file, your system may be susceptible to ``trojan
horses'' or other subtle attacks from miscreants who create dangerous
package files.
You are advised to verify the competence and identity of those who pro-
vide installable package files. For extra protection, use the -M flag to
extract the package file, and inspect its contents and scripts to ensure
it poses no danger to your system's integrity. Pay particular attention
to any +INSTALL, +POST-INSTALL, +DEINSTALL, +POST-DEINSTALL, +REQUIRE or
+MTREE_DIRS files, and inspect the +CONTENTS file for @cwd, @mode (check
for setuid), @dirrm, @exec, and @unexec directives, and/or use the
pkg_info(1) command to examine the package file.