docs: @ReadOperation
      public Map<String, Map> allMetrics() {
  
          Map<String, Map> results = new HashMap<>();
          // JVM stats
          results.put("jvm", this.jvmMemoryMetrics());
          // HTTP requests stats
          results.put("http.server.requests", this.httpRequestsMetrics());
          // Cache stats
          results.put("cache", this.cacheMetrics());
          // Service stats
          results.put("services", this.serviceMetrics());
          // Database stats
          results.put("databases", this.databaseMetrics());
          // Garbage collector
          results.put("garbageCollector", this.garbageCollectorMetrics());
          // Process stats
          results.put("processMetrics", this.processMetrics());
  
          return results;
      }