init(broker) {
		this.broker = broker;
		this.metrics = broker.metrics;

		if (this.broker) {
			this.logger = broker.getLogger("cacher");

			if (this.opts.prefix) {
				this.prefix = this.opts.prefix + "-";
			} else {
				this.prefix = "MOL-";
				if (this.broker.namespace) this.prefix += this.broker.namespace + "-";
			}

			this.registerMoleculerMetrics();
		}
	}
Initialize cacher

@param {any} broker

@memberof Cacher