fastapi-alertengine 1.1.2

Production-grade request metrics middleware and SLO alert engine for FastAPI + Redis Streams

⚡ fastapi-alertengine

Drop-in request monitoring + alerting for FastAPI — in under 60 seconds.

No Prometheus. No Grafana. No dashboards.

Just install → add middleware → get real-time alerts.

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🚀 Quick Start

from fastapi import FastAPI
from fastapi_alertengine import RequestMetricsMiddleware, get_alert_engine
import redis

app = FastAPI()

redis_client = redis.Redis.from_url("redis://localhost:6379/0")

app.add_middleware(RequestMetricsMiddleware, redis=redis_client)

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⚡ Live Alerts Endpoint

Expose real-time system health:

alert_engine = get_alert_engine(redis_client=redis_client)

@app.get("/health/alerts")
def alerts():
    return alert_engine.evaluate(window_size=200)

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📊 Example Output

{
  "status": "ok | warning | critical",
  "metrics": {
    "overall_p95_ms": 123.4,
    "webhook_p95_ms": 234.5,
    "api_p95_ms": 110.2,
    "error_rate": 0.03,
    "anomaly_score": 0.8,
    "sample_size": 187
  }
}

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⚡ What You Get Instantly

• 📊 P95 latency (overall, API, webhook)
• 🚨 Error rate detection (failure pressure signal)
• 🧠 Anomaly detection vs baseline
• ⚡ Rolling window analysis (real-time)
• 🔌 Simple JSON health endpoint

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🧠 Why This Exists

Most FastAPI monitoring stacks require:

• Prometheus
• Grafana
• Complex dashboards

That's overkill for most teams.

fastapi-alertengine gives you the core signals that actually matter:

• Is the system slowing down?
• Are failures increasing?
• Is something anomalous happening right now?

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🏦 Financial-Grade Design

This system is derived from production infrastructure used in AnchorFlow.

Designed for:

• High-reliability environments
• Payment orchestration systems
• Audit-friendly monitoring outputs

Key characteristics:

• Deterministic P95 calculation
• Failure pressure signal (error rate)
• Structured JSON output for downstream systems
• Safe middleware (never breaks request flow)

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⚙️ Default Thresholds

• P95 Warning: 1000ms
• P95 Critical: 3000ms
• Error Rate Critical: 20%

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📦 Public API

AlertEngine
RequestMetricsMiddleware
get_alert_engine

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🤖 AI-Agent Friendly

Designed for:

• Claude Code
• GitHub Copilot
• Cursor

Agents can integrate it automatically in seconds.

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💼 Production Setup (Starter Pack — $49)

Includes:

• Redis + FastAPI deployment setup
• Alert tuning for real workloads
• Scaling patterns
• Direct support

📩 Contact: [e-mail]

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🧱 Roadmap

• Slack / email alerting
• Remote alert engine (SaaS)
• Multi-service correlation
• Lightweight dashboard

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📜 Requirements

• Python 3.10+
• FastAPI
• Redis