feat(providers): [copilot.ts]Add OTel cache token parsing including tests and regression checks.

[steelp02]

Signed-off-by: steelp02 pieter.steel@pfizer.com

Summary

Testing

• I have tested this locally against real data (not just unit tests). The costs codeburn displays align with github copilot costs online
• npm test passes
• npm run build succeeds

For new providers only:

• I installed the tool and generated real sessions by using it
• npm run dev -- today shows correct costs and session counts for this provider
• npm run dev -- models --provider <name> shows correct model names and pricing
• Screenshot or terminal output attached below proving it works with real data

[ Today ] 7 Days 30 Days This Month 6 Months
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ CodeBurn Today │
│ $55.58 cost 806 calls 131 sessions 46.0% cache hit │
│ 16.1M in 256.6K out 14.8M cached 1.3M written │
│ Custom (all): $59.30 API-equivalent vs $1000.00 plan ▓░░░░░░░░░ 5.9% │
│ Well within plan. Projected month: $76.13 (reset in 21 days). │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
╭────────────────────────────────────────────────────────────────╮╭────────────────────────────────────────────────────────────────╮
│ Daily Activity ││ By Project │
│ cost calls ││ cost avg/s sess │
│ 06-10 ██████████ $55.58 806 ││ ██████████ copilot/chat $55.58 $0.431 129 │
│ ││ ░░░░░░░░░░ codeburn $0.00 $0.00 1 │
│ ││ ░░░░░░░░░░ xxxxx $0.00 $0.00 1 │
╰────────────────────────────────────────────────────────────────╯╰────────────────────────────────────────────────────────────────╯
╭────────────────────────────────────────────────────────────────╮╭────────────────────────────────────────────────────────────────╮
│ By Activity ││ By Model │
│ cost turns 1-shot ││ cost cache calls 1-shot │
│ ██████████ Exploration $52.13 303 - ││ ██████████ Sonnet 4.6 $52.93 46.0% 147 - │
│ █░░░░░░░░░ Conversation $3.46 496 - ││ ░░░░░░░░░░ Haiku 4.5 $2.60 46.1% 37 - │
│ ░░░░░░░░░░ Debugging $0.00 4 - ││ ░░░░░░░░░░ GPT-4o Mini $0.047 45.7% 115 - │
│ ░░░░░░░░░░ Feature Dev $0.00 1 - ││ ░░░░░░░░░░ copilot-sugges $0.00 0.0% 4 - │
│ ░░░░░░░░░░ Brainstorming $0.00 2 - ││ ░░░░░░░░░░ copilot-nes-oc $0.00 0.0% 4 - │
│ ││ ░░░░░░░░░░ Copilot (Anthr $0.00 - 499 - │
╰────────────────────────────────────────────────────────────────╯╰────────────────────────────────────────────────────────────────╯
╭────────────────────────────────────────────────────────────────╮╭────────────────────────────────────────────────────────────────╮
│ Core Tools ││ Shell Commands │
│ calls ││ No shell commands │
│ ██████████ Shell 5358 ││ │
│ █████░░░░░ Read 2883 ││ │
│ ███░░░░░░░ replace_string_in_file 1585 ││ │
│ ██░░░░░░░░ manage_todo_list 1126 ││ │
│ █░░░░░░░░░ grep_search 609 ││ │
│ █░░░░░░░░░ file_search 269 ││ │
│ ░░░░░░░░░░ create_file 191 ││ │
│ ░░░░░░░░░░ list_dir 57 ││ │
│ ░░░░░░░░░░ kill_terminal 38 ││ │
│ ░░░░░░░░░░ get_terminal_output 16 ││ │
╰────────────────────────────────────────────────────────────────╯╰────────────────────────────────────────────────────────────────╯
╭────────────────────────────────────────────────────────────────╮╭────────────────────────────────────────────────────────────────╮
│ Skills & Agents ││ MCP Servers │
│ No skill/agent usage ││ No MCP usage │
╰────────────────────────────────────────────────────────────────╯╰────────────────────────────────────────────────────────────────╯
╭──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ <> switch q quit 1 today 2 week 3 30 days 4 month 5 6 months d yesterday o optimize c compare │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

[steelp02]

Otel information: https://code.visualstudio.com/docs/agents/guides/monitoring-agents
Additional instructions to get it working: enable otel by adding these two lines to settings.json in vscode:
"github.copilot.chat.otel.enabled": true, "github.copilot.chat.otel.dbSpanExporter.enabled": true

[dat-intellis]

Otel information: https://code.visualstudio.com/docs/agents/guides/monitoring-agents Additional instructions to get it working: enable otel by adding these two lines to settings.json in vscode: "github.copilot.chat.otel.enabled": true, "github.copilot.chat.otel.dbSpanExporter.enabled": true

is there a corresponding copilot-cli setting to enable otel?

[steelp02]

Otel information: https://code.visualstudio.com/docs/agents/guides/monitoring-agents Additional instructions to get it working: enable otel by adding these two lines to settings.json in vscode: "github.copilot.chat.otel.enabled": true, "github.copilot.chat.otel.dbSpanExporter.enabled": true

is there a corresponding copilot-cli setting to enable otel?

export COPILOT_OTEL_ENABLED=true
export OTEL_EXPORTER_OTLP_ENDPOINT="http://localhost:4318"

[iamtoruk]

Merged via #498, which preserves your commits and adds maintainer review fixes on top (debug-log cleanup, parameterized the spans IN() query, folded an N+1, epochToISO guard, dead-code removal, and docs for the Node 22+ requirement + the durable-cache monotonicity behavior). Thanks for the contribution. Closing in favor of #498.