[opentelemetry-instrumentation-express] How to ignore static

[thpoiani]

🙇 Thank you for this project and support.
I have a question: How to ignore static files using http and express instrumentation?

app.use(express.static('public'))

[dyladan]

I created an issue for this as it is really a feature request #2815

[dyladan]

One way to solve this immediately would be to implement a custom sampler. I believe samplers have access to enough information to solve this, but I could be mistaken.

[thpoiani]

Thank you. For now I am setting the paths and files in the HttpInstrumentation.ignoreIncomingPaths:

registerInstrumentations({
    instrumentations: [
      new HttpInstrumentation({
        ignoreIncomingPaths: [
          /\/app/,
          /\/css/,
          /\/fonts/,
          /\/images/,
          "/manifest.json",
        ],
      }),
      new ExpressInstrumentation(),
      new SequelizeInstrumentation(),
    ],
});

[vmarchaud]

@thpoiani For some reason i didn't saw this at the same time but you should be able to add a configuration to ignore path starting with /public:

new HttpInstrumentation({
   ignoreIncomingRequestHook: request => {
        return request.url.startWith("/public")
   },
})