firecrawl-observability

Firecrawl Observability

Overview

Monitor Firecrawl web scraping pipelines for success rates, credit consumption, content quality, and latency. Key signals: scrape success rate, crawl job completion, credit burn velocity, extraction quality (did markdown actually contain useful content vs error pages), and webhook delivery health.

Key Metrics

Metric	Type	Why It Matters
firecrawl_scrapes_total	Counter	Track scrape volume and success rate
firecrawl_credits_used	Counter	Monitor credit consumption
firecrawl_scrape_duration_ms	Histogram	Detect latency issues
firecrawl_content_quality	Counter	Catch empty/error pages
firecrawl_crawl_jobs_total	Counter	Track crawl job outcomes

Instructions

Step 1: Instrumented Firecrawl Wrapper

import FirecrawlApp from "@mendable/firecrawl-js";

const firecrawl = new FirecrawlApp({
  apiKey: process.env.FIRECRAWL_API_KEY!,
});

// Counters (use your metrics library: prom-client, statsd, datadog, etc.)
function emit(metric: string, value: number, tags?: Record<string, string>) {
  console.log(JSON.stringify({ metric, value, tags, timestamp: Date.now() }));
}

export async function instrumentedScrape(url: string) {
  const start = Date.now();
  try {
    const result = await firecrawl.scrapeUrl(url, {
      formats: ["markdown"],
      onlyMainContent: true,
    });

    const duration = Date.now() - start;
    const quality = evaluateQuality(result);

    emit("firecrawl_scrapes_total", 1, { status: "success" });
    emit("firecrawl_scrape_duration_ms", duration);
    emit("firecrawl_credits_used", 1);
    emit("firecrawl_content_quality", 1, { quality });

    return result;
  } catch (error: any) {
    emit("firecrawl_scrapes_total", 1, {
      status: "error",
      error_code: String(error.statusCode || "unknown"),
    });
    emit("firecrawl_scrape_duration_ms", Date.now() - start);
    throw error;
  }
}

function evaluateQuality(result: any): string {
  const md = result.markdown || "";
  if (md.length < 100) return "empty";
  if (/404|not found|access denied|captcha/i.test(md)) return "error_page";
  if (!/^#{1,3}\s/m.test(md)) return "no_structure";
  return "good";
}

Step 2: Credit Consumption Monitor

async function checkCreditHealth() {
  const response = await fetch("https://api.firecrawl.dev/v1/team/credits", {
    headers: { Authorization: `Bearer ${process.env.FIRECRAWL_API_KEY}` },
  });
  const data = await response.json();

  emit("firecrawl_credits_remaining", data.credits_remaining || 0);

  if (data.credits_remaining < 1000) {
    console.warn(`LOW CREDITS: ${data.credits_remaining} remaining`);
    emit("firecrawl_credit_alert", 1, { level: "warning" });
  }
  if (data.credits_remaining < 100) {
    emit("firecrawl_credit_alert", 1, { level: "critical" });
  }

  return data;
}

// Run every hour
setInterval(checkCreditHealth, 3600000);

Step 3: Crawl Job Tracking

export async function monitoredCrawl(url: string, limit: number) {
  const start = Date.now();

  const job = await firecrawl.asyncCrawlUrl(url, {
    limit,
    scrapeOptions: { formats: ["markdown"] },
  });

  emit("firecrawl_crawl_jobs_total", 1, { status: "started" });

  // Poll with metrics
  let status = await firecrawl.checkCrawlStatus(job.id);
  while (status.status === "scraping") {
    emit("firecrawl_crawl_progress", status.completed || 0, { jobId: job.id });
    await new Promise(r => setTimeout(r, 5000));
    status = await firecrawl.checkCrawlStatus(job.id);
  }

  const duration = Date.now() - start;
  emit("firecrawl_crawl_jobs_total", 1, { status: status.status });
  emit("firecrawl_crawl_duration_ms", duration);
  emit("firecrawl_crawl_pages", status.data?.length || 0);
  emit("firecrawl_credits_used", status.data?.length || 0);

  return status;
}

Step 4: Prometheus Alert Rules

groups:
  - name: firecrawl
    rules:
      - alert: FirecrawlHighFailureRate
        expr: rate(firecrawl_scrapes_total{status="error"}[1h]) / rate(firecrawl_scrapes_total[1h]) > 0.1
        annotations:
          summary: "Firecrawl error rate exceeds 10%"

      - alert: FirecrawlCreditLow
        expr: firecrawl_credits_remaining < 500
        annotations:
          summary: "Firecrawl credits below 500 — refill soon"

      - alert: FirecrawlHighLatency
        expr: histogram_quantile(0.95, firecrawl_scrape_duration_ms) > 15000
        annotations:
          summary: "Firecrawl p95 latency exceeds 15 seconds"

      - alert: FirecrawlPoorQuality
        expr: rate(firecrawl_content_quality{quality="empty"}[1h]) / rate(firecrawl_content_quality[1h]) > 0.2
        annotations:
          summary: "Over 20% of scrapes returning empty content"

Step 5: Dashboard Panels

Track these in Grafana/Datadog:

• Scrape volume: sum(rate(firecrawl_scrapes_total[5m])) by status
• Credit burn rate: sum(rate(firecrawl_credits_used[1h])) — credits/hour
• Latency p50/p95: histogram_quantile(0.5, firecrawl_scrape_duration_ms)
• Content quality: Pie chart of firecrawl_content_quality by quality label
• Credits remaining: Single stat with thresholds (green > 1000, yellow > 100, red < 100)

Error Handling

Issue	Cause	Solution
High failure rate	Target sites blocking	Enable waitFor, rotate target URLs
Poor content quality	JS not rendering	Increase waitFor or use actions
Credit burn spike	Unbounded crawl	Enforce limit on all crawl calls
Missing metrics	Wrapper not used	Ensure all scrape calls go through instrumented wrapper

Resources

• Firecrawl API Reference
• prom-client (Prometheus for Node.js)
• Grafana Dashboards

Next Steps

For incident response, see firecrawl-incident-runbook.