feat(agent): Agent UUID and config file

[kox13]

Refs #16

Most of the work for this issue is completed. The remaining gap is extending the config file to support metrics (currently only collectors are configurable).

This PR introduces a persistent agent UUID and extends the configuration file with new runtime options.

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UUID

A UUID is generated on startup only if the file agent.uuid does not already exist (typically on the first launch).
Once created, the UUID is persisted and reused across subsequent restarts.

Currently, the UUID is generated using a custom GenerateUUIDv4 function from the utils namespace.
In the future, this may be replaced with a dedicated UUID library.

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Configuration File

The configuration file has been extended with the following new options:

• interval
• server_address
• server_port
• collectors

Options Overview

• interval (uint32)
  Interval between metric collections, in milliseconds.

• server_address (string)
  Central server address (IP address or hostname).

• server_port (uint16)
  Central server port. Must be non-zero.

• collectors
  Section defining enabled collectors.
  Each key contains an array of strings specifying collector backends.

Supported Collectors

• cpu

  • proc_stat
  • cpu_freq
  • rapl
  • zenpower
  • pmu

• gpu

  • nvml
  • dcgm
  • rocm
  • level_zero

• ram

  • mem_info
  • vm_stat

• io

  • disk_stats
  • net_dev

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Notes

At this stage, only collectors are configurable.
Metrics associated with individual collectors will be exposed and configurable in a future update.