For reasons that I don’t want to get into right now, I have an application that provides #Prometheus metrics. But not via an HTTP /metrics endpoint, but instead by streaming Prom’s text-based format over a serial port. The stream is endless, metrics are sent in random order. Their values update infrequently by simply appearing a second time in the stream, with the new value.
Is there already an utility that can consume such a stream and provide a normal /metrics HTTP endpoint?
It's a pretty dirty hack, but it works, and once I find the time to clean it up a little I might even release it.
Why did I need it in the first place? To get some sensor readings off of an #MicroPython board. I wrote classes that can output #Prometheus text to serve via HTTP, but then found out that running BLE & Wi-Fi simultaneously is a fickle bitch, so I had to pivot to, erm, USB UART and simply gave Gauge.update() a print(str(self)). 🤷♂️
When you're writing code to make sure your 100 liter water tank and plumbing in your fucking van don't explode tonight, some clean code aspirations become secondary.
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