# Diagnosing a 28,232-Connection SSE Limit in a Go Leaderboard

DevFeed: [Diagnosing a 28,232-Connection SSE Limit in a Go Leaderboard](<https://devfeed.tech/articles/breaking-the-28k-sse-connection-limit-and-scaling-toward-1m-39412.md>)

Original publisher: [Read original article](<https://blog.pranshu-raj.in/posts/scaling-sse-1m-connections/>)

Author: Pranshu Raj

Published: 2026-07-23T00:00:00Z

Content type: tutorial

Language: en

Sources: [Pranshu Raj - blog on backend systems, performance and sidequests](<https://devfeed.tech/sources/pranshu-raj-blog-on-backend-systems-performance-and-sidequests.md>)

Topics: [Server-sent events (SSE)](<https://devfeed.tech/topics/server-sent-events-sse.md>), [Go Language](<https://devfeed.tech/topics/go-language.md>), [Docker Compose](<https://devfeed.tech/topics/docker-compose.md>), [Redis](<https://devfeed.tech/topics/redis.md>), [Grafana](<https://devfeed.tech/topics/grafana.md>), [Prometheus](<https://devfeed.tech/topics/prometheus.md>)

Tags: [docker-compose](<https://devfeed.tech/tags/docker-compose.md>), [go](<https://devfeed.tech/tags/go.md>), [grafana](<https://devfeed.tech/tags/grafana.md>), [prometheus](<https://devfeed.tech/tags/prometheus.md>), [redis](<https://devfeed.tech/tags/redis.md>), [sse](<https://devfeed.tech/tags/sse.md>)

## AI overview

A tutorial on testing and diagnosing the SSE connection limit of a Go leaderboard service. It describes the service architecture, Docker Compose deployment, and monitoring with Prometheus and Grafana.

## Source excerpt

Why my Go leaderboard's capped at exactly 28,232 SSE connections, how Docker networking got me to 150k, and the path toward millions.