Prometheus Weathermen

“You don't need a weatherman to know which way the wind blows”
       — Bob Dylan, Subterranean Homesick Blues

A prometheus exporter endpoint for weather data or my excuse to do some Rust for real.

What it does

Provides a Prometheus metrics endpoint on <host>:36333/metrics and serves the following metrics for configured location from each configured provider:

• weather_temperature_celsius: Temperature in celsius
• weather_relative_humidity_ratio: Humidify ratio (0.0 to 1.0)
• weather_station_distance_meters: Distance of the weather station in meters

Supported providers

The following services are implemented as providers. Each configured provider is queried for weather information.

You need to register an account for those providers that require an API key.

Installation

Pre-built containers

Readymade containers are available for linux/amd64, linux/arm64 and linux/arm/v7. Download weathermen.toml.dist to weathermen.toml into the current folder and adjust the configuration.

This is how to run the container using Docker:

docker run -p 36333:36333 \
    -v $(pwd)/weathermen.toml:/etc/prometheus-weathermen/weathermen.toml \
    lstrojny/prometheus-weathermen:latest

The container is also available from the GitHub container registry via ghcr.io/lstrojny/prometheus-weathermen.

Pre-built binaries

Go to the latest release and download the appropriate binary for your platform.

The following platforms are supported:

Please open an issue if your favorite platform is missing. It’s probably not terribly much work to get it going.

There are dbg (debug) variants of the binaries. These are unstripped debug builds. If you don’t know what that is, you don’t want it.

For the Linux builds, static variants based on musl libc are available. These are statically linked binaries that can be used to run prometheus-weathermen in a container with minimal fuzz. The non-static counterparts for Linux are build against glibc.

Configuration

Check weathermen.toml.dist for configuration options.

Configuration values can also be set from environment variables with the prefix PROMW_. For example, to set the HTTP port from an environment variable, use PROMW_HTTP__PORT=12345. The double underscore is not a typo, it is necessary to disambiguate hierarchy from name. Assume this TOML config:

[provider.open_weather]
api_key = "XYZ"

The corresponding env variable would be PROMW_PROVIDER__OPEN_WEATHER__API_KEY.

License

This project is distributed under either:

• The Apache License, Version 2.0, (LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0)
• The MIT license (LICENSE-MIT or https://opensource.org/licenses/MIT)