feat: update grafana dashboards

[gaius-qi]

Description

This pull request makes several updates to the Grafana dashboard configurations for the Manager, Scheduler, and Seed Client components. The main changes focus on improving metric accuracy, standardizing units, optimizing panel layouts, and cleaning up unused panels.

Metric calculation and unit standardization:

• Updated all relevant Prometheus metric expressions in seed-client.json to multiply traffic rates by 8, converting from bytes per second to bits per second for more accurate bandwidth representation. [1] [2] [3] [4] [5] [6]
• Standardized the unit for bandwidth metrics from binBps/Bps to binbps across all panels in seed-client.json for consistency. [1] [2] [3] [4] [5] [6]

Dashboard layout and panel adjustments:

• Removed the "Disk Write" and "Disk Read" timeseries panels from seed-client.json to streamline the dashboard and reduce clutter.
• Adjusted panel grid positions in seed-client.json to fill gaps left by removed panels and maintain a clean layout. [1] [2] [3] [4] [5] [6] [7]
• In scheduler.json, removed the "Traffic" pie chart panel and expanded the "UP" panel for better visibility. [1] [2]

Dashboard time range updates:

• Changed the default time range for all dashboards (manager.json, scheduler.json, and seed-client.json) from the last 6 hours to the last 3 hours for more recent data focus. [1] [2] [3]

Versioning:

• Updated the version numbers in all affected dashboard JSON files to reflect these changes. [1] [2] [3]

Related Issue

Motivation and Context

[chlins]

lgtm