customerio-observability

name	customerio-observability
description	Set up Customer.io monitoring and observability. Use when implementing metrics, structured logging, alerting, or Grafana dashboards for Customer.io integrations. Trigger: "customer.io monitoring", "customer.io metrics", "customer.io dashboard", "customer.io alerts", "customer.io observability".
allowed-tools	Read, Write, Edit, Bash(npm:*), Bash(npx:*), Glob, Grep
version	1.14.0
license	MIT
author	Jeremy Longshore <[e-mail]>
tags	["saas","customer-io","monitoring","observability","prometheus"]
compatibility	Designed for Claude Code

Customer.io Observability

Overview

Implement comprehensive observability for Customer.io integrations: Prometheus metrics (latency, error rates, delivery funnel), structured JSON logging with PII redaction, OpenTelemetry tracing, and Grafana dashboard definitions.

Prerequisites

• Customer.io integration deployed
• Prometheus + Grafana (or compatible metrics stack)
• Structured logging system (pino recommended)

Key Metrics to Track

Metric	Type	Description	Alert Threshold
cio_api_duration_ms	Histogram	API call latency	p99 > 5000ms
cio_api_requests_total	Counter	Total API requests by operation	N/A (rate)
cio_api_errors_total	Counter	API errors by status code	> 1% error rate
cio_email_sent_total	Counter	Transactional + campaign emails	N/A
cio_email_bounced_total	Counter	Bounce count	> 5% of sends
cio_email_complained_total	Counter	Spam complaints	> 0.1% of sends
cio_webhook_received_total	Counter	Webhook events by metric type	N/A
cio_queue_depth	Gauge	Pending items in event queue	> 10K

Instructions

Step 1: Prometheus Metrics

// lib/customerio-metrics.ts
import { Counter, Histogram, Gauge, Registry } from "prom-client";

const registry = new Registry();

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 { registry };