ch16 ingredient add metrics

ch16/ingredient/ingredient-service/src/main/java/com/example/ingredientservice/IngredientController.java

@@ -1,6 +1,7 @@
 package com.example.ingredientservice;
 
 import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
+import io.micrometer.core.instrument.MeterRegistry;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
@@ -18,10 +19,12 @@
 public class IngredientController {
 
  private IngredientRepository repo;
+ private final MeterRegistry meterRegistry;
 
  @Autowired
- public IngredientController(IngredientRepository repo) {
+ public IngredientController(IngredientRepository repo, MeterRegistry meterRegistry) {
  this.repo = repo;
+ this.meterRegistry = meterRegistry;
  }
 
  @GetMapping
@@ -44,6 +47,7 @@ private Iterable<Ingredient> getDefaultIngredients() throws InterruptedException
 
  @GetMapping("/{id}")
  public Optional<Ingredient> byId(@PathVariable String id) {
+ meterRegistry.counter("tacocloud", "ingredient", id).increment();
  return repo.findById(id);
  }