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106 lines
2.4 KiB
Markdown
106 lines
2.4 KiB
Markdown
# Observability Patterns
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## Usage-Based Billing
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```typescript
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env.ANALYTICS.writeDataPoint({
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blobs: [customerId, request.url, request.method],
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doubles: [1], // request_count
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indexes: [customerId]
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});
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```
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```sql
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SELECT blob1 AS customer_id, SUM(_sample_interval * double1) AS total_calls
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FROM api_usage WHERE timestamp >= DATE_TRUNC('month', NOW())
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GROUP BY customer_id
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```
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## Performance Monitoring
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```typescript
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const start = Date.now();
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const response = await fetch(url);
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env.ANALYTICS.writeDataPoint({
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blobs: [url, response.status.toString()],
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doubles: [Date.now() - start, response.status]
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});
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```
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```sql
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SELECT blob1 AS url, AVG(double1) AS avg_ms, percentile(double1, 0.95) AS p95_ms
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FROM fetch_metrics WHERE timestamp >= NOW() - INTERVAL '1' HOUR
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GROUP BY url
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```
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## Error Tracking
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```typescript
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env.ANALYTICS.writeDataPoint({
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blobs: [error.name, request.url, request.method],
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doubles: [1],
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indexes: [error.name]
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});
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```
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## Multi-Tenant Tracking
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```typescript
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env.ANALYTICS.writeDataPoint({
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indexes: [tenantId], // efficient filtering
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blobs: [tenantId, url.pathname, method, status],
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doubles: [1, duration, bytesSize]
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});
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```
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## Tail Worker Log Filtering
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```typescript
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export default {
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async tail(events, env, ctx) {
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const critical = events.filter(e =>
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e.exceptions.length > 0 || e.event.wallTime > 1000000
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);
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if (critical.length === 0) return;
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ctx.waitUntil(
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fetch('https://logging.example.com/ingest', {
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method: 'POST',
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headers: { 'Authorization': `Bearer ${env.API_KEY}` },
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body: JSON.stringify(critical.map(e => ({
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outcome: e.event.outcome,
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cpu_ms: e.event.cpuTime / 1000,
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errors: e.exceptions
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})))
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})
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);
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}
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};
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```
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## OpenTelemetry Export
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```typescript
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export default {
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async tail(events, env, ctx) {
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const otelSpans = events.map(e => ({
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traceId: generateId(32),
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spanId: generateId(16),
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name: e.scriptName || 'worker.request',
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attributes: [
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{ key: 'worker.outcome', value: { stringValue: e.event.outcome } },
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{ key: 'worker.cpu_time_us', value: { intValue: String(e.event.cpuTime) } }
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]
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}));
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ctx.waitUntil(
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fetch('https://api.honeycomb.io/v1/traces', {
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method: 'POST',
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headers: { 'X-Honeycomb-Team': env.HONEYCOMB_KEY },
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body: JSON.stringify({ resourceSpans: [{ scopeSpans: [{ spans: otelSpans }] }] })
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})
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);
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}
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};
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```
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