Standard sFlow instrumentation is built into network equipment from over 40 vendors. The sFlow.org web site maintains a list - see Network Equipment.
Switch configurations maintains instructions for configuring sFlow on many of these devices.
The Host sFlow agent exports standard metrics from AIX, FreeBSD, Linux, Solaris, and Windows hosts; Docker containers; Hyper-V, KVM/libvirt, and Xen hypervisors. The Host sFlow agent can also be used to relay custom sFlow-RT metrics.
Host sFlow agent extensions are used to monitor Apache and NGINX web servers, HAProxy, Tomcat, Java virtual machines, and Memcached servers.