Unsupported Media Type\",\"name\":\"OTLPExporterError\" when using telemetry-to-otlp

[gopalanand333]

Hi Team,
I am using telemetry-to-otlp and deploy application to kyma runtime, with package.json looks like this:

"dependencies": {
    "@cap-js/hana": "^1",
    "@cap-js/telemetry": ">=0",
    "@grpc/grpc-js": "^1",
    "@opentelemetry/exporter-metrics-otlp-grpc": "^0",
    "@opentelemetry/exporter-metrics-otlp-proto": "^0.55.0",
    "@opentelemetry/exporter-trace-otlp-grpc": "^0",
    "@opentelemetry/exporter-trace-otlp-proto": "^0.55.0",
    "@opentelemetry/host-metrics": "^0",
    "@sap/cds": ">=8",
    "@sap/xssec": "^4",
    "express": "^4"
  },
"[production]": {
        "telemetry": {
          "kind": "telemetry-to-otlp"
        },

Error

2024-11-29T02:40:41.536195408Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:41.534Z","msg":"loaded model from 1 file(s):\n","type":"log"}
2024-11-29T02:40:41.536896541Z   srv/csn.json
2024-11-29T02:40:41.903970021Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:41.902Z","msg":"connect to db > hana {\n  certificate: '...',\n  database_id: 'bc80cfe7-53a8-4216-a8a7-88b44997f337',\n  driver: 'com.sap.db.jdbc.Driver',\n  hdi_password: '...',\n  hdi_user: '1D6B74619D3140D397D052F5F52B360A_5J9XPMZKO0A2FHAFNLF4UBKHQ_DT',\n  host: 'bc80cfe7-53a8-4216-a8a7-88b44997f337.hana.prod-eu12.hanacloud.ondemand.com',\n  password: '...',\n  port: '443',\n  schema: '1D6B74619D3140D397D052F5F52B360A',\n  url: 'jdbc:sap://bc80cfe7-53a8-4216-a8a7-88b44997f337.hana.prod-eu12.hanacloud.ondemand.com:443?encrypt=true&validateCertificate=true&currentschema=1D6B74619D3140D397D052F5F52B360A',\n  user: '1D6B74619D3140D397D052F5F52B360A_5J9XPMZKO0A2FHAFNLF4UBKHQ_RT'\n}","type":"log"}
2024-11-29T02:40:41.948611207Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:41.948Z","msg":"using auth strategy {\n  kind: 'xsuaa',\n  impl: '../layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@sap/cds/lib/srv/middlewares/auth/jwt-auth'\n} \n","type":"log"}
2024-11-29T02:40:41.978843936Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:41.978Z","msg":"using new OData adapter","type":"log"}
2024-11-29T02:40:41.992007746Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:41.991Z","msg":"serving ProcessorService { impl: 'srv/services.js', path: '/odata/v4/processor' }","type":"log"}
2024-11-29T02:40:41.992547017Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:41.992Z","msg":"serving AdminService { impl: 'srv/services.js', path: '/odata/v4/admin' }","type":"log"}
2024-11-29T02:40:42.108227194Z 
2024-11-29T02:40:42.108250215Z {"level":"info","logger":"cds","timestamp":"2024-11-29T02:40:42.106Z","msg":"server listening on { url: 'http://localhost:8080' }","type":"log"}
2024-11-29T02:40:42.108253185Z [cds] - launched at 11/29/2024, 2:40:41 AM, version: 8.5.0, in: 710.288ms
2024-11-29T02:40:48.568054181Z {"level":"error","logger":"telemetry","timestamp":"2024-11-29T02:40:48.567Z","msg":"{\"stack\":\"OTLPExporterError: Unsupported Media Type\\n    at IncomingMessage.<anonymous> (/layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/otlp-exporter-base/build/src/platform/node/http-transport-utils.js:62:31)\\n    at /layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/context-async-hooks/build/src/AbstractAsyncHooksContextManager.js:50:55\\n    at AsyncLocalStorage.run (node:async_hooks:335:14)\\n    at AsyncLocalStorageContextManager.with (/layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/context-async-hooks/build/src/AsyncLocalStorageContextManager.js:33:40)\\n    at IncomingMessage.contextWrapper (/layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/context-async-hooks/build/src/AbstractAsyncHooksContextManager.js:50:32)\\n    at IncomingMessage.emit (node:events:531:35)\\n    at endReadableNT (node:internal/streams/readable:1696:12)\\n    at process.processTicksAndRejections (node:internal/process/task_queues:82:21)\",\"message\":\"Unsupported Media Type\",\"name\":\"OTLPExporterError\",\"code\":\"415\"}","type":"log"}
2024-11-29T02:40:58.520264917Z {"level":"error","logger":"telemetry","timestamp":"2024-11-29T02:40:58.519Z","msg":"{\"stack\":\"OTLPExporterError: Unsupported Media Type\\n    at IncomingMessage.<anonymous> (/layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/otlp-exporter-base/build/src/platform/node/http-transport-utils.js:62:31)\\n    at /layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/context-async-hooks/build/src/AbstractAsyncHooksContextManager.js:50:55\\n    at AsyncLocalStorage.run (node:async_hooks:335:14)\\n    at AsyncLocalStorageContextManager.with (/layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/context-async-hooks/build/src/AsyncLocalStorageContextManager.js:33:40)\\n    at IncomingMessage.contextWrapper (/layers/paketo-buildpacks_npm-install/launch-modules/node_modules/@opentelemetry/context-async-hooks/build/src/AbstractAsyncHooksContextManager.js:50:32)\\n    at IncomingMessage.emit (node:events:531:35)\\n    at endReadableNT (node:internal/streams/readable:1696:12)\\n    at process.processTicksAndRejections (node:internal/process/task_queues:82:21)\",\"message\":\"Unsupported Media Type\",\"name\":\"OTLPExporterError\",\"code\":\"415\"}","type":"log"}

[sjvans]

hi @gopalanand333

why do you have both grpc and protobuf exporters? you should only have one. please see https://opentelemetry.io/docs/languages/sdk-configuration/otlp-exporter/ on how to configure which is used via env vars.

best,
sebastian