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o11y: add OpenTelemetry instrumentation to user service

Openniwoerner wants to merge 3 commits

internal/api/user_handler.goLine 23

23 func GetUserHandler(w http.ResponseWriter, r *http.Request) {
24   userID := r.PathValue("id")
25   tracer := otel.Tracer("user-service")
26   ctx, span := tracer.Start(r.Context(), "GET /users/"+userID)
27   defer span.End()
28  
29   user, err := db.FindUserByID(ctx, userID)
30   // ...
31 }

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High cardinality span name

Including the user ID in the span name creates a unique span for every user, causing cardinality explosion. Use the route template pattern instead.

HTTP Server Span Best Practices

Suggested change

internal/api/user_handler.go

func GetUserHandler(w http.ResponseWriter, r *http.Request) {
  userID := r.PathValue("id")
  tracer := otel.Tracer("user-service")
  ctx, span := tracer.Start(r.Context(), "GET /users/:id")
  defer span.End()

  user, err := db.FindUserByID(ctx, userID)
  // ...
}

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High-cardinality span name detected

This span name includes the userId which creates high cardinality. Each unique user generates a different span name, making traces harder to aggregate and increasing costs.

💡 Recommendation: Use a constant span name and add userId as an attribute instead.

Suggested change

- span := tracer.Start(ctx, "process_{userId}")
+ span := tracer.Start(ctx, "process_user")
+ span.SetAttributes(attribute.String("user.id", userId))

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Changes Applied Successfully

Your instrumentation now follows OpenTelemetry best practices. The span name is constant, and user ID is properly stored as an attribute for better aggregation.

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High-cardinality span name detected

This span name includes the userId which creates high cardinality. Each unique user generates a different span name, making traces harder to aggregate and increasing costs.

💡 Recommendation: Use a constant span name and add userId as an attribute instead.

Suggested change

- span := tracer.Start(ctx, "process_{userId}")
+ span := tracer.Start(ctx, "process_user")
+ span.SetAttributes(attribute.String("user.id", userId))

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src/services/auth.tsLine 42

42-span.setAttribute('user.id', userId)
43+span.setAttribute('user.type', userType)

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High Cardinality Risk

Using user.id as an attribute can cause cost spikes due to high cardinality.

Suggested change

src/services/auth.ts

- span.setAttribute('user.id', userId)+ span.setAttribute('user.type', userType)

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Review comments include explanations and examples to help your team understand OpenTelemetry best practices

- setAttribute('user.email', email)// ⚠️ PII Leak Risk- setAttribute('session.token', token)// ⚠️ High Cardinality (500K+ values)

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A new way ofinstrumenting your code.

o11y: add OpenTelemetry instrumentation to user service

Instrumentation isn't easy

Data Explosion and Scalability

Complexity and Inconsistencies

Time Investment

Meet OllyGarden Rose

Automated PR Reviews

One-Click Fixes

Agentic Instrumentation

Automated PR Reviews

One-Click Fixes

Agentic Instrumentation

Complete Codebase Assessment

Autonomous Instrumentation Setup

Automated PR Reviews

Built for Developer Productivity

Context-Aware Analysis

Catch Issues Early

Save Time

Learn from OTel Expertise

Instrumentation You Can Trust

Ready to ship better instrumentation?

Join Rose Research Preview