Clever Cloud is today the main developer of Sōzu, a Reverse Proxy that was developped at Clever Cloud, in Rust, to meet the needs of our infrastructure for performance and hot reloading. Sōzu is used throughout Clever Cloud, paired with HAProxy, to route traffic to our customer's applications.

Prometheus is a monitoring and alerting software suite.
This simple connector operates alongside Sōzu. It waits for HTTP requests on the /metrics route, queries Sōzu for its metrics, formats the metrics to be Prometheus-compatible, and sends them in the HTTP response.
This means that Prometheus metrics are readily available on the IP address of a Sōzu machine.

Apache Pulsar is a highly scalable messaging platform. We use it extensively at Clever Cloud because of its distributed aspect and cutting-edge throughput performance.
The Sōzu Pulsar connector subscribes to a Pulsar topic and transmits messages to Sōzu. Sōzu uses these messages to perform hot reloading on the proxy, which is a key feature of our Reverse Proxy.
What it means for us and anyone using the Sōzu ecosystem: this connector enables updating traffic redirection in real time.

PKI stands for Public Key Infrastructure, an omnipresent security framework on the Internet, typically used for securing connections with HTTPS (among other things). In the PKI framework, Sōzu functions as a TLS endpoint: it decrypts HTTPS traffic into HTTP traffic.
The Sōzu PKI connector runs alongside Sōzu, watches over a given directory in the file system, reads TLS certificates that were put there by either human or machine, and transmits them to Sōzu.
Then , what this ultimately means is: write a TLS certificate on the machine, Sōzu will have it.