I think greenbone-security-assistant should be removed for the same reasons as openvas-*: it's based on openvas-scanner, already missing build dependency libxslt-dev and therefore FTBFS, looks like buildd could never build it on any architecture (binary package gsad on i386 was probably uploaded by the maintainer), gsad is missing runtime dependency libmicrohttpd5, unmaintained since 2011, apparently unused (it has no popcon entry at all).
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