SmokePing is a mature network latency monitoring and visualization application written in Perl. It measures round-trip time and packet loss to targets using a wide variety of pluggable probes (ICMP, TCP, HTTP, DNS, SSH, SNMP, etc.), stores the time-series data in RRD files, and presents interactive web-based graphs via a CGI/FastCGI interface. The architecture includes a daemon that runs probes on a schedule, a master/slave mode for distributed monitoring, and an alerting system that can trigger notifications based on configurable patterns or matcher plugins. While primarily an application, it also includes data analysis components such as matchers and sorters that compute statistics (median, loss, standard deviation) from stored data. The codebase is monolithic in parts (Smokeping.pm >3000 lines) and uses outdated JavaScript libraries, but offers well-designed extensibility through probe base classes and a self-contained SNMP stack (BER.pm, SNMP_Session.pm) that could be reused independently.