AlertServerWakeUp
by Mat1212
AlertServerWakeUp writes a console message when a player joins and the server leaves its deep sleep state, filling a gap in vanilla logging.
What it does
Vanilla Minecraft pauses the tick loop when the server is empty, and its logs only record that the server went to sleep and woke up. AlertServerWakeUp adds a console message at the moment activity resumes, so an administrator watching the console sees when a player returns and the server unpauses.
The mod is a small server-side Fabric build for Minecraft 1.21.11 and is published only for that single version, 1.0.0 for 1.21.11, released 2026-04-12. Only the server needs it; players join without installing anything. Fabric Loader 0.16.0 and Fabric API are required. The code is open source under the GNU General Public License v3.0 or later.
Key features
Wake up notification
A message is written to the server console when a player joins and the server exits deep pause.
Status command
A console-only command reports how many seconds remain before the server enters deep pause.
Console-only output
Status information is limited to the console and hidden from players in the game.
Minimal footprint
The mod is small and runs only on the server, adding no client-side content.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Watching an idle server
Administrators running a server that empties often can see in the console when a player returns and the tick loop resumes.
Checking time before pause
Before players log off, an operator can check how many seconds remain until the server suspends its tick loop.
Who it’s for: Server owners and administrators who run Fabric servers on 1.21.11 and want console messages about the server's pause and wake cycle.
How it compares
Sleep Control is server-side only, uses All rights reserved and is published for 1.21 – 1.21.11 on Fabric, so it covers the same version as AlertServerWakeUp but is not open source. SleepLog is also server-side only and open source under the GNU General Public License v3.0 or later, with files for 1.21.11 – 26.1.2, extending past this mod's single version. Can-I-Sleep-Now is client-side only, uses a custom license and is not open source, with a file for 1.21.8 only.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| AlertServerWakeUp | Fabric | 1.21.11 | Server-side only | 2026-04-12 |
| Sleep Control | Fabric | 1.21 – 1.21.11 | Server-side only | 2026-02-27 |
| SleepLog | Fabric | 1.21.11 – 26.1.2 | Server-side only | 2026-04-07 |
| Can-I-Sleep-Now | Fabric | 1.21.8 | Client-side only | 2025-09-05 |
Questions
Does AlertServerWakeUp need to be installed on player clients?
Which loader and version does AlertServerWakeUp require?
Why does the server need this mod if vanilla already pauses?
In the catalog
AlertServerWakeUp is one of 8,016 Management mods on ModsFinder, and one of 5,930 Management mods for Fabric. 19,862 mods support Minecraft 1.21.11.
More from Mat1212
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What the author says
A lightweight, server-side Fabric mod for Minecraft 1.21.11 that monitors the server's deep sleep state and alerts you when it wakes up. Minecraft servers have a built-in feature (since Java_Edition_24w33a aka 1.21.2) to pause their tick loop when empty (pause-when-empty-seconds in server.properties) to save CPU…
Official listing
- Modrinth page
- modrinth.com/mod/alertserverwakeup
- Owner
- Mat1212
- Published
- 2026-04-12
- Updated on Modrinth
- 2026-04-12
- Facts verified
- 2026-10-15