Again, a highly envious feature of a large organisation with almost exclusively bespoke applications that can port & integrate custom libraries directly into applications. Us little people have to contend with mostly black box applications, or occasionally native instrumented with at best a prom-alike endpoint.

Amusingly in the pre-web 1990's, at Telstra (Australia telco) we also developed & implemented a custom performance monitoring library that was integrated into in-house applications.