Users are reporting service timeouts and performance issues. The administrator notices that only the minimum number of instances are running during performance spikes. They want to monitor usage trends before adjusting instance settings. Which action should the administrator perform?

ArcGIS Server Manager provides a built-in mechanism to collect, aggregate, and report on service statistics. These reports are specifically designed to help administrators understand usage trends over time, including metrics like request counts, average response times, timeouts, and instance usage. By creating and analyzing these reports, the administrator can gather the necessary data to determine if the minimum and maximum instance settings for services are configured appropriately to handle performance spikes, directly addressing the scenario's requirements before making changes.

A. Monitor Task Manager on each ArcGIS Server machine: Task Manager provides real-time system resource usage but does not offer historical trend analysis or service-specific statistics needed to make informed configuration changes.
B. Change the log level to Debug in ArcGIS Server Manager: Debug-level logging is for intensive, granular troubleshooting of specific errors. It does not provide performance trend summaries and can severely degrade server performance.
D. Enable Windows Performance Monitor: While a powerful tool for monitoring system counters, the native ArcGIS Server statistics reports provide more direct, service-oriented metrics (e.g., average response time) in a readily accessible format for this specific task.

1. Esri ArcGIS Enterprise Documentation, "Work with server statistics": "ArcGIS Server can generate reports with statistics on how your services are being used. Analyzing these statistics can help you tune your services for better performance and troubleshoot problems in your site." This directly supports using server statistics for performance tuning. (ArcGIS Enterprise 11.0 Documentation, Administer ArcGIS Server > Logs > Work with server statistics).

2. Esri ArcGIS Enterprise Documentation, "Reports in ArcGIS Server Manager": This page details the types of reports available, which include "Maximum running instances," "Requests," and "Average response time." These are the exact metrics needed to analyze usage trends and justify changes to instance settings. (ArcGIS Enterprise 11.0 Documentation, Administer ArcGIS Server > Logs > Work with server statistics > Reports in ArcGIS Server Manager).

3. Esri ArcGIS Enterprise Documentation, "Tune service instances": "You can use the statistics generated by ArcGIS Server to help you determine if you need to adjust the minimum and maximum number of instances for your services... For example, if you see that your service frequently has a high number of running instances, you might consider increasing the maximum number of instances." (ArcGIS Enterprise 11.0 Documentation, Services > Configure services > Tune services > Tune service instances).