[Feature][gh-copilot] Expose newly available GitHub Copilot metrics in CLI

[fool65c]

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• I had searched in the issues and found no similar feature requirement.

Use case

The gh-copilot plugin currently ingests organization/enterprise-level aggregate metrics, per-user daily activity counts, and breakdowns by feature, IDE, and language. However, several metric dimensions available in the GitHub Copilot Metrics Reports API are not collected, leaving gaps that prevent fully analyzing Copilot adoption and ROI.

Description

The following metrics are available in the GitHub Copilot Metrics Reports API (users-1-day and enterprise endpoints) but are not currently collected by the gh-copilot plugin:

CLI Metrics (totals_by_cli)
CLI/terminal usage is a fast-growing Copilot surface. The API provides per-user per-day CLI metrics that are not collected:

Field	Type	Description
session_count	int	Number of CLI sessions
request_count	int	Number of CLI requests
prompt_count	int	Number of prompts sent via CLI
token_usage.output_tokens_sum	bigint	Total output tokens consumed
token_usage.prompt_tokens_sum	bigint	Total prompt/input tokens consumed
token_usage.avg_tokens_per_request	float	Average tokens per request
last_known_cli_version.cli_version	string	CLI version (e.g. "1.0.8")
last_known_cli_version.sampled_at	timestamp	When version was last observed

Related issues

#8843 -- GitHub App authentication for gh-copilot

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

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