# Third-party notices

No third-party code is included in this repository, and that claim is load-bearing: both upstreams named below are AGPL-3.0, which this repository's GPL-3.0-or-later license cannot carry, so nothing was copied from either and no license text is reproduced here.

Two designs are followed, each named at the lines of ours that follow it:

- The metric and label vocabulary in `internal/metrics/descs.go` follows [prometheus-plex-exporter](https://github.com/jsclayton/prometheus-plex-exporter) (AGPL-3.0), the Grafana Hackathon 2022 exporter this project builds on. Ours is the three-tier server, library and play label hierarchy (`internal/metrics/descs.go:11-20`) and the descriptors that reuse it: `plex_server_info` (`:47`), `plex_host_cpu_utilization_ratio` and `plex_host_memory_utilization_ratio` (`:51` and `:55`), `plex_library_duration_milliseconds` (`:59`), `plex_library_storage_bytes` (`:63`), `plex_transmit_bytes_total` (`:71`) and `plex_play_seconds_total` (`:83`), which carry upstream's `server_info`, `host_cpu_util`, `host_mem_util`, `library_duration_total`, `library_storage_total`, `transmit_bytes_total` and `play_seconds_total` under a `plex_` prefix with the unit in the name. The code behind them is unrelated: upstream tracks sessions over a websocket event stream, this exporter polls `/status/sessions` and reconciles the snapshots in `internal/sessions`.
- Three label additions follow the [@timothystewart6 fork](https://github.com/timothystewart6/prometheus-plex-exporter) (AGPL-3.0) of that exporter: `plex_library_items` with its `content_type` label (`internal/metrics/descs.go:67`), and the `transcode_type` and `subtitle_action` play labels (`internal/metrics/descs.go:19`).