export_traces.ts

import { NodeTracerProvider } from '@opentelemetry/node'
import { Resource } from '@opentelemetry/resources'
import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http'
import { BatchSpanProcessor } from '@opentelemetry/tracing'
import { trace } from '@opentelemetry/api'

const resource = new Resource({ 'service.name': 'api-feature-flag-manager' })
const provider = new NodeTracerProvider({ resource })

import { registerInstrumentations } from '@opentelemetry/instrumentation'
import { HttpInstrumentation } from '@opentelemetry/instrumentation-http'
import { ExpressInstrumentation } from '@opentelemetry/instrumentation-express'
import { MongoDBInstrumentation } from '@opentelemetry/instrumentation-mongodb'
import { IORedisInstrumentation } from '@opentelemetry/instrumentation-ioredis'

registerInstrumentations({
  tracerProvider: provider,
  instrumentations: [
    new ExpressInstrumentation(),
    new MongoDBInstrumentation(),
    new IORedisInstrumentation(),
    new HttpInstrumentation({
      ignoreIncomingPaths: ['/v1/status', '/metrics', '/health-check', ...[]],
    }),
  ],
})

const collectorOptions = {
  url: 'http://localhost:4318/v1/traces', // url is optional and can be omitted - default is http://localhost:55681/v1/traces
  headers: {}, // an optional object containing custom headers to be sent with each request
  concurrencyLimit: 10, // an optional limit on pending requests
}

const otlpExporter = new OTLPTraceExporter(collectorOptions)
provider.addSpanProcessor(
  new BatchSpanProcessor(otlpExporter, {
    // The maximum queue size. After the size is reached spans are dropped.
    maxQueueSize: 100,
    // The maximum batch size of every export. It must be smaller or equal to maxQueueSize.
    maxExportBatchSize: 10,
    // The interval between two consecutive exports
    scheduledDelayMillis: 500,
    // How long the export can run before it is cancelled
    exportTimeoutMillis: 30000,
  })
)
provider.register()
trace.setGlobalTracerProvider(provider)