Comprehensive and Detailed Explanation:

Performance issues require systematic resolution:

Option B:Analyzing metrics (via Monitoring > Instances or Dashboards) identifies bottlenecks (e.g., slow external calls, large payloads), enabling targeted optimization (e.g., batching, caching). This is the best practice.

Option A:Deleting and recreating loses history and is inefficient without diagnosis.

Option C:Reactivation might reset transient issues but doesn’t address root causes.

Option D:Scaling instances increases cost without guaranteeing resolution if the bottleneck is elsewhere.

Data-driven optimization ensures effective synchronization.