# From Custom to Open: Scalable Network Probing and HTTP/3 Readiness with Prometheus

DevFeed: [From Custom to Open: Scalable Network Probing and HTTP/3 Readiness with Prometheus](<https://devfeed.tech/articles/from-custom-to-open-scalable-network-probing-and-http-3-readiness-with-prometheus-145.md>)

Original publisher: [Read original article](<https://slack.engineering/from-custom-to-open-scalable-network-probing-and-http-3-readiness-with-prometheus/>)

Author: Carlo Preciado

Published: 2026-03-31T17:00:39Z

Content type: article

Language: en

Sources: [Engineering at Slack](<https://devfeed.tech/sources/engineering-at-slack.md>)

Topics: [telemetry](<https://devfeed.tech/topics/telemetry.md>)

Tags: [aws](<https://devfeed.tech/tags/aws.md>), [go](<https://devfeed.tech/tags/go.md>), [golang](<https://devfeed.tech/tags/golang.md>), [http](<https://devfeed.tech/tags/http.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [metrics](<https://devfeed.tech/tags/metrics.md>), [monitoring](<https://devfeed.tech/tags/monitoring.md>), [networking](<https://devfeed.tech/tags/networking.md>), [observability](<https://devfeed.tech/tags/observability.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [prometheus](<https://devfeed.tech/tags/prometheus.md>), [uncategorized](<https://devfeed.tech/tags/uncategorized.md>)

## AI overview

Slack added and open-sourced QUIC support for Prometheus Blackbox Exporter to enable configurable HTTP/3 probes and restore client-side observability for its HTTP/3 endpoints.

## Source excerpt

The Problem: Legacy Tooling and Its Limitations Currently, Slack utilizes a hybrid approach to network measurement, incorporating both internal (such as traffic between AWS Availability Zones) and external (monitoring traffic from the public internet into Slack's infrastructure) solutions. These tools comprise a combination of commercial SaaS offerings and custom-built network testing solutions developed by our...