docs(gremlin): create ntfy

Netgrimoire/Services/ntfy/ntfy.md

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+# ntfy
+
+## Overview
+The ntfy stack is a Docker Swarm-based infrastructure for serving push notifications in NetGrimoire. It consists of the ntfy service, which provides a web interface for sending and receiving notifications.
+
+---
+
+## Architecture
+| Service | Image | Port | Role |
+|---------|-------|-----|------|
+- **ntfy:** binwiederhier/ntfy | 81:80 | - | Notification Service |
+- **Caddy:** ntfy.netgrimoire.com (reverse proxy) | - | - | Reverse Proxy |
+- **Uptime Kuma:** ntfy.ntfy.http.url (monitoring) | - | https://ntfy.netgrimoire.com | Monitoring |
+
+---
+
+## Build & Configuration
+
+### Prerequisites
+A Docker Swarm manager node with Docker 20.10 or higher installed.
+
+### Volume Setup
+```bash
+mkdir -p /DockerVol/ntfy/cache
+mkdir -p /DockerVol/ntfy/etc
+```
+
+### Environment Variables
+```bash
+generate: openssl rand -hex 32
+NTFY_API_KEY=1234567890abcdef
+NTFY_SECRET_KEY=9876543210fedcba
+```
+
+### Deploy
+```bash
+cd services/swarm/stack/ntfy
+set -a && source .env && set +a
+docker stack config --compose-file ntfy-stack.yml > resolved.yml
+docker stack deploy --compose-file resolved.yml ntfy
+rm resolved.yml
+docker stack services ntfy
+```
+
+### First Run
+After deploying, the `NTFY_API_KEY` and `NTFY_SECRET_KEY` environment variables need to be set.
+
+---
+
+## User Guide
+
+### Accessing ntfy
+| Service | URL | Purpose |
+|---------|-----|---------|
+- **ntfy:** https://ntfy.netgrimoire.com (web interface)
+
+### Primary Use Cases
+To use the ntfy service, navigate to its web interface and follow the prompts.
+
+### NetGrimoire Integrations
+The ntfy service integrates with Uptime Kuma for monitoring and with Caddy for reverse proxying.
+
+---
+
+## Operations
+
+### Monitoring
+```bash
+docker stack services ntfy
+docker logs -f ntfy | grep "http"
+```
+
+### Backups
+Critical data is stored in /DockerVol/ntfy/cache. For reconstructability, /DockerVol/ntfy/etc should be backed up as well.
+
+### Restore
+```bash
+cd services/swarm/stack/ntfy
+./deploy.sh
+```
+
+---
+
+## Common Failures
+| Symptom | Cause | Fix |
+|---------|------|-----|
+| Service not responding | Insufficient resources | Scale ntfy service or increase CPU resource allocation |
+| Caddy errors | Misconfigured reverse proxy | Review and correct caddy configuration |
+| Uptime Kuma connection issues | Incorrect monitoring settings | Check and adjust monitoring configuration |
+
+---
+
+## Changelog
+
+| Date | Commit | Summary |
+|------|--------|---------|
+| 2026-05-01 | f88c14c9 | Initial deployment of ntfy stack in Docker Swarm |
+| 2026-04-07 | 5058dbe5 | Implemented reverse proxy with Caddy and integrated Uptime Kuma for monitoring |
+
+<Note: This service has undergone changes to migrate from a single configuration file to the swarm-based approach. The `swarm/ntfy.yaml` file now serves as the primary source of truth, and any future changes will be made directly in this file.>