WIP: Start drafting an otel opentracing plugin.

[arthurschreiber]

Description

See vitessio#18283 for the upstream PR.

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

[Copilot]

Pull Request Overview

This PR adds an OpenTelemetry-based OpenTracing bridge plugin for Vitess tracing and updates module dependencies accordingly.

• Implements a new newOtelTracer factory that wires OTLP exporter, tracer provider, and OpenTracing bridge
• Registers the plugin under tracingBackendFactories["opentracing-otel"]
• Bumps and adds required OpenTelemetry and related dependencies in go.mod

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
go/trace/plugin_otel.go	Introduces OTEL tracer provider, OTLP exporter, and OpenTracing bridge with cleanup logic
go.mod	Upgrades existing dependencies and adds OpenTelemetry modules

Comments suppressed due to low confidence (2)

go/trace/plugin_otel.go:42

• There are no tests covering the newOtelTracer initialization or its integration into the tracing registry. Consider adding unit tests to verify correct exporter setup, propagator configuration, and error paths.

func newOtelTracer(serviceName string) (tracingService, io.Closer, error) {

go/trace/plugin_otel.go:113

• [nitpick] The field name bridgeTracer mirrors its type and may be redundant. Consider renaming to something more concise (e.g., tracerBridge or simply tracer) to improve readability.

bridgeTracer *otelBridge.BridgeTracer

[Copilot]

Leaving a TODO without a tracking issue or implementation plan may get lost. Either implement protocol selection via flags now or reference a GitHub issue to track this work.

Suggested change

	// TODO: Add support for specifying other protocols via a flag
	client := otlptracehttp.NewClient()
	// Determine the protocol to use based on the flag
	var client otlptrace.Client
	switch protocol {
	case "http":
	client = otlptracehttp.NewClient()
	case "grpc":
	client = otlptracegrpc.NewClient()
	default:
	return nil, &nilCloser{}, fmt.Errorf("unsupported protocol: %s", protocol)
	}