Adding Telemetry increase in startup time

[askareija]

Before using telemetry:

time bun run start

bun:/workspaces/backend-boilerplate$ time bun run start
$ bun run src/index.ts
{"level":20,"time":1727344749180,"pid":22433,"hostname":"boilerplate-backend","name":"backend-boilerplate","msg":"[ElysiaRoutes]: ASSIGN: healthCheckRoutes"}
{"level":20,"time":1727344749180,"pid":22433,"hostname":"boilerplate-backend","name":"backend-boilerplate","msg":"[ElysiaRoutes]: ASSIGN: roleRoutes"}
{"level":30,"time":1727344749183,"pid":22433,"hostname":"boilerplate-backend","name":"backend-boilerplate","msg":"[ElysiaWebServer]: API is running at localhost:5000"}

real    0m0.081s
user    0m0.108s
sys     0m0.045s

After using telemetry:

time bun run start

bun:/workspaces/backend-boilerplate$ time bun run start
$ bun run src/index.ts
{"level":20,"time":1727344894412,"pid":23617,"hostname":"boilerplate-backend","name":"backend-boilerplate","msg":"[ElysiaRoutes]: ASSIGN: healthCheckRoutes"}
{"level":20,"time":1727344894412,"pid":23617,"hostname":"boilerplate-backend","name":"backend-boilerplate","msg":"[ElysiaRoutes]: ASSIGN: roleRoutes"}
{"level":30,"time":1727344894415,"pid":23617,"hostname":"boilerplate-backend","name":"backend-boilerplate","msg":"[ElysiaWebServer]: API is running at localhost:5000"}

real    0m0.383s
user    0m0.403s
sys     0m0.079s

I know it doesn't significant increase, maybe some delay for 300~400ms, but still..

i don't know if this is on purpose or it could be more enchanced

this is the implementation:

export const app = new Elysia({
  precompile: true,
});

app.use(ip());
app.use(cors());

// NOTE: Use openTelemetry for distributed tracing
// FIXME: This is adding some startup time
app.use(
  opentelemetry({
    serviceName: APP_NAME,
    spanProcessors: [
      new BatchSpanProcessor(
        new OTLPTraceExporter({
          url: `http://${OTEL_BACKEND_HOST}/v1/traces`,
        })
      ),
    ],
  })
);

export async function startServer(port: number) {
  // NOTE: Assigning routes
  logger.debug("[ElysiaRoutes]: ASSIGN: healthCheckRoutes");
  app.use(import("../health-check/health-check.route"));

  logger.debug("[ElysiaRoutes]: ASSIGN: roleRoutes");
  app.use(import("../role/role.route"));

  app.listen(port);
  logger.info(
    `[ElysiaWebServer]: API is running at ${app.server?.hostname}:${app.server?.port}`
  );
  process.exit();
}

[askareija]

I've resolved it by using another instance and use lazy load module.

in main.ts:

app.use(import("./otel"));

then create new Elysia instance otel.ts:

import { BatchSpanProcessor } from "@opentelemetry/sdk-trace-node";
import { OTLPTraceExporter } from "@opentelemetry/exporter-trace-otlp-proto";
import { APP_NAME, OTEL_BACKEND_HOST } from "../utils/constants";
import Elysia from "elysia";
import { opentelemetry } from "@elysiajs/opentelemetry";

const spanProcessor = new BatchSpanProcessor(
  new OTLPTraceExporter({
    url: `http://${OTEL_BACKEND_HOST}/v1/traces`,
  })
);

const otelModule = new Elysia({
  prefix: "otel",
});
otelModule.use(
  opentelemetry({
    serviceName: APP_NAME,
    spanProcessors: [spanProcessor],
  })
);

export default otelModule;