Worked on the Shopify/ruby repository to restore DTrace USDT probe support for Ruby on FreeBSD, addressing a long-standing observability gap. The solution involved removing an obsolete build override in the Autoconf configuration, which allowed standard DTrace detection to function correctly on modern FreeBSD systems. Using build engineering skills, the developer verified that Ruby binaries built with --enable-dtrace now expose 22 USDT probes and register successfully under dtrace(1). This fix enables more reliable diagnostics and performance tuning for Ruby applications on FreeBSD, improving production observability and reducing debugging time for teams deploying Ruby in these environments.