fix(sysinfo): use RSS instead of usage_in_bytes for cgroup memory stats

[gaius-qi]

Description

This pull request introduces several improvements and refactors to the system resource monitoring components, primarily focusing on enhanced accuracy, async handling, and richer diagnostics. The most notable changes are the switch to async CPU stat collection, improved cgroup support for container environments, and the addition of detailed debug logging throughout the sysinfo modules.

Resource Monitoring Enhancements

• Made CPU stat collection methods (get_stats and get_process_stats in CPU) asynchronous, allowing for more accurate and up-to-date readings by refreshing and waiting between samples. [1] [2]
• Refactored cgroup stats handling for both CPU and memory, including improved calculation for used percent, and added support for reporting cgroup stats when running in a container. [1] [2] [3] [4]

Container Environment Support

• Added detection for container environments and conditional reporting of cgroup CPU and memory stats in the SchedulerAnnouncer. [1] [2] [3] [4]
• Updated overload detection logic to use the new async CPU stat methods and improved memory percent calculation. [1] [2]

Debug Logging Improvements

• Introduced detailed debug logging in sysinfo modules for CPU, memory, disk, and network, providing visibility into resource usage calculations and aiding troubleshooting. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Version Updates

• Bumped the workspace and crate versions from 1.2.17 to 1.2.18 in Cargo.toml, and updated all workspace dependency versions accordingly. [1] [2]

Code Structure and Accuracy Improvements

• Improved calculation of used percent for CPU and memory, clamping results to valid ranges, and using logical core count consistently. [1] [2] [3] [4] [5] [6]

These changes collectively increase the reliability and transparency of system resource monitoring, especially in containerized environments, and facilitate easier debugging and maintenance.

Related Issue

Motivation and Context

Screenshots (if appropriate)

[chlins]

lgtm

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.82%. Comparing base (f27be76) to head (4073bac).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
dragonfly-client-util/src/sysinfo/memory.rs	0.00%	3 Missing ⚠️
dragonfly-client-util/src/ratelimiter/bbr.rs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1739      +/-   ##
==========================================
+ Coverage   46.79%   46.82%   +0.03%     
==========================================
  Files          87       87              
  Lines       24883    24881       -2     
==========================================
+ Hits        11643    11650       +7     
+ Misses      13240    13231       -9     

Files with missing lines	Coverage Δ
dragonfly-client-util/src/ratelimiter/bbr.rs	79.20% <33.33%> (ø)
dragonfly-client-util/src/sysinfo/memory.rs	26.31% <0.00%> (+0.89%)	⬆️

... and 1 file with indirect coverage changes

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