-| Name | Status | Language | Tested-on | Description |
-|--------|---------------------|-----------|-------------------------|-------------|
-| __x1__ | Archive, complete | Bash, AWK | Ubuntu 16.04 | Single, synchronous script, saving state in text files |
-| __x2__ | Legacy , complete | Bash, AWK | Debian 10, Ubuntu 18.04 | Parallel processes: collectors, cache and reporters; passing messages through a single named pipe |
-| __x3__ | Archive, incomplete | OCaml | Debian 10 | Re-write and refinement of __x2__ |
-| __x4__ | Archive, incomplete | Dash, AWK | Debian 10 | Sensors are completely decoupled daemons, cache is a file tree |
-| __x5__ | Current, incomplete | C | Ubuntu 18.04 | Sensors are completely decoupled daemons, writing to dedicated named pipes, bar repeatedly `select`s and reads the pipes. |
+| Name | Status | Language | Tested-on | Description |
+|--------|----------|-----------|-------------------------|-------------|
+| __x1__ | Archived | Bash, AWK | Ubuntu 16.04 | Single, synchronous script, saving state in text files. |
+| __x2__ | Archived | Bash, AWK | Debian 10, Ubuntu 18.04 | Sensors are child processes, IPC via parent pipe. |
+| __x3__ | Archived | OCaml | Debian 10 | Re-write and refinement of __x2__ |
+| __x4__ | Archived | Dash, AWK | Debian 10 | Sensors are opaque daemons, cache is a file tree |
+| __x5__ | [Graduated](https://github.com/xandkar/pista) | C | Ubuntu 18.04 | Sensors are opaque daemons, IPC via [pselect](https://en.wikipedia.org/wiki/Select_(Unix))ed FIFOs. |