OTLP JSON: injest traces with int fields

[vrutkovs]

Describe the bug

Some JSON payloads fail with:

requestURI: /insert/opentelemetry/v1/traces; cannot read OpenTelemetry protocol data: cannot unmarshal request from 2750 protobuf bytes: cannot unmarshal JSON request: json: invalid use of ,string struct tag, trying to unmarshal unquoted value into *int64

This is happening with the payload containing int types

To Reproduce

$ cat foo.json                  
{
    "resourceSpans": [
        {
            "resource": {
                "attributes": [
                    {
                        "key": "service.name",
                        "value": {
                            "stringValue": "test-service",
                            "intValue": 10
                        }
                    }
                ]
            },
            "scopeSpans": [
                {
                    "scope": {
                        "name": "test"
                    },
                    "spans": [
                        {
                            "traceId": "5b8efff798038103d269b633813fc60c",
                            "spanId": "eee19b7ec3c1b174",
                            "name": "test-span",
                            "kind": 1,
                            "startTimeUnixNano": "1775779200000000000",
                            "endTimeUnixNano": "1775779201000000000",
                            "status": {}
                        }
                    ]
                }
            ]
        }
    ]
}
$ curl \      
    -H "Content-Type: application/json" \
    -X POST https://vt.vrutkovs.eu/insert/opentelemetry/v1/traces \
    -d @foo.json

cannot read OpenTelemetry protocol data: cannot unmarshal request from 1043 protobuf bytes: cannot unmarshal JSON request: json: invalid use of ,string struct tag, trying to unmarshal unquoted value into *int64

Version

0.8.0

Logs

2026-04-10T10:54:48.083Z warn VictoriaTraces/app/vtinsert/opentelemetry/otlphttp.go:139 remoteAddr: "192.168.1.185:52000, X-Forwarded-For: 192.168.1.254"; requestURI: /insert/opentelemetry/v1/traces; cannot read OpenTelemetry protocol data: cannot unmarshal request from 1043 protobuf bytes: cannot unmarshal JSON request: json: invalid use of ,string struct tag, trying to unmarshal unquoted value into *int64

Screenshots

No response

Used command-line flags

No response

Additional information

No response

[jiekun]

Thank you. Confirm as a bug caused by the wrong assumption of intValue JSON field, which could be either string or int64 while VT assume it as string only.

The bug shall be fixed soon and included as part of the upcomming release.