OpenCensus is a collection of libraries designed to increase the observability of systems by providing APIs for gathering metrics and trace data, adding tags, and sending that data to a backend for storage. It provides standards-based instrumentation, including exporters for metrics and traces, such as the Prometheus exporter, which uses the Prometheus exposition format. OpenCensus is integrated with Telegraf, an InfluxData collection agent, allowing for seamless interaction and easy collection of data from OpenCensus-instrumented applications. The project enables developers to collect metrics by editing a few lines in the Telegraf configuration file and enabling the Prometheus plugin, making it easy to expose metrics in the Prometheus exposition format.