Add database query monitoring metrics

Author: shaykeren

src/main/java/org/springframework/samples/petclinic/monitoring/DatabaseMetrics.java

@@ -0,0 +1,31 @@
+package org.springframework.samples.petclinic.monitoring;
+
+import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.Timer;
+import org.aspectj.lang.ProceedingJoinPoint;
+import org.aspectj.lang.annotation.Around;
+import org.aspectj.lang.annotation.Aspect;
+import org.springframework.stereotype.Component;
+
+@Aspect
+@Component
+public class DatabaseMetrics {
+    private final MeterRegistry registry;
+
+    public DatabaseMetrics(MeterRegistry registry) {
+        this.registry = registry;
+    }
+
+    @Around("execution(* org.springframework.samples.petclinic.activity.ClinicActivityController.*(..))")
+    public Object measureQueryTime(ProceedingJoinPoint joinPoint) throws Throwable {
+        Timer.Sample sample = Timer.start(registry);
+        try {
+            return joinPoint.proceed();
+        } finally {
+            sample.stop(Timer.builder("clinic.activity.query.time")
+                    .description("Time taken for clinic activity queries")
+                    .tag("method", joinPoint.getSignature().getName())
+                    .register(registry));
+        }
+    }
+}