Micrometer in Spring Boot 3 | Interview Question and Answers | Code Decode

Micrometer Interview Questions & Answers First! Spring Boot 3 Explained for All Levels – Freshers to Experienced by Code Decode

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*What is Micrometer*

First, let's understand with an analogy



Think of your Spring Boot app like a restaurant:

Metrics (Micrometer):
"How many burgers were ordered?"
"How long did cooking take?"
"How long is the restaurant waiting queue?"
Tracing (Micrometer Tracing):
"What happened from the time the customer entered, placed an order, order was cooked, and served?"
Micrometer helps you collect all this — automatically or manually.


*Micrometer in spring Boot 3*

Before (Spring Boot 2):
Metrics were optional, tracing wasn’t baked in (**Micrometer** was used for *metrics only* (not tracing))
Tracing (if needed) required *manual integration* with libraries like *Brave* (for Zipkin) or *OpenTelemetry*
You had to choose and configure things manually (like Prometheus or Zipkin or splunk)


Now (Spring Boot 3):
*Micrometer is part of the core observability system*
It supports:
*Metrics* (as before)
*Tracing* (new via **Micrometer Tracing**)
It handles tracing using either *Brave* or *OpenTelemetry*
It works with Actuator endpoints like `/actuator/metrics` and `/actuator/health`


Is *Micrometer Tracing* truly “out of the box” in Spring Boot 3?
❌ **No**, it is **not fully out of the box**.
You *must add the right dependencies* to activate tracing. It **requires a bridge dependency to be functional**.


What is **Micrometer Tracing**?
Micrometer Tracing lets you *trace a request* as it moves through *different services and components**, and records **how long* each part took.

It gives you:

**Trace ID**: ID for the whole request
**Spans**: Individual timed steps in the request
**Context propagation**: Carries tracing info across services

Want to switch engines?
You don’t need to change the wheel (Micrometer Tracing) — just use a different bridge:

`micrometer-tracing-bridge-brave` 🔌 → connects to *Brave*
`micrometer-tracing-bridge-otel` 🔌 → connects to *OpenTelemetry*





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