feature: all c-states telemetry

[harp-intel]

This pull request refactors the telemetry codebase to generalize and improve how CPU C-state residency metrics are handled. Instead of focusing solely on C6 residency, the code now supports collecting and displaying all relevant C-state metrics dynamically, making the telemetry tool more flexible and future-proof. The changes include renaming variables and functions, updating help texts, and introducing a more robust extraction mechanism for C-state fields.

The most important changes are:

Generalization of C-state telemetry:

• Replaced all references to "C6" with "C-state" throughout the codebase, including variable and flag names, help texts, and menu labels, to reflect the broader support for multiple CPU C-states instead of just C6. [1] [2] [3] [4] [5] [6]
• Updated the telemetry table definition to dynamically build fields for all detected C-state metrics, rather than hard-coding for C6 only. The table now adapts to whatever C-state fields are present in the data. [1] [2]

Data extraction improvements:

• Added a new function TurbostatPlatformRowsByRegexMatch in extract/turbostat.go to extract all C-state-related fields from the turbostat output using regular expressions, enabling support for a variety of C-state metrics across different CPU platforms.

Renderer and output updates:

• Refactored the HTML renderer function for C6 to a generalized C-state renderer, and updated axis labels to be more generic. [1] [2]
• Updated table registration and summary output to use the new C-state telemetry table and removed the hardcoded C6 residency summary field. [1] [2] [3]

[Copilot]

Pull request overview

This PR generalizes the telemetry command’s CPU idle residency reporting from a C6-only view to a dynamic “all C-states” view, by extracting C-state-related turbostat columns via regex and building telemetry fields at runtime. It also includes a sizable refactor of DIMM parsing logic and adds DIMM unit tests.

Changes:

• Add regex-driven turbostat platform-row extraction to support dynamic C-state field discovery.
• Replace C6 telemetry table/renderer/flag plumbing with generalized “C-States” equivalents and dynamically built table fields.
• Refactor DIMM format detection/extraction and add extensive DIMM unit test coverage.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
internal/extract/turbostat.go	Adds TurbostatPlatformRowsByRegexMatch for regex-based field extraction from platform rows.
cmd/telemetry/telemetry_tables.go	Replaces C6 table values builder with dynamic C-state field discovery and table construction.
cmd/telemetry/telemetry_renderers.go	Renames and generalizes the C6 HTML renderer and updates axis labeling.
cmd/telemetry/telemetry.go	Renames the C6 telemetry category flag and updates table/renderer registration and summary output.
internal/extract/dimm.go	Refactors DIMM format handling into an ordered dimmFormats definition and simplifies parsing/extraction.
internal/extract/dimm_test.go	Adds comprehensive tests for DIMM parsing and socket/slot extraction behavior.