**Purpose:** declares the metrics you currently track on the live system,
sliced by deployment segment (so Bridge can reason about deployment-context
calibration).
Required columns:
| Column | Type | Required | Description |
|---|---|---|---|
| `slice_id` | string | yes | stable identifier for this deployment slice (e.g., `geo:us-east`, `tenant:enterprise`, `traffic:beta`) |
| `slice_description` | string | yes | human-readable slice meaning (≤200 chars) |
| `metric_name` | string | yes | metric tracked on this slice (e.g., `success_rate`, `p95_latency_ms`, `customer_csat`) |
| `metric_value_current` | float | yes | most recent observed value |
| `metric_value_baseline` | float | no | pre-deployment baseline (if available) |
| `observation_window_start` | ISO-8601 date | yes | start of observation period |
| `observation_window_end` | ISO-8601 date | yes | end of observation period |
| `sample_size` | int | yes | number of requests / users / cases observed in this window |
| `notes` | string | no | free-form notes |
**Minimum row count:** 3 (at least 3 distinct slices; one-slice systems hide deployment-context heterogeneity)
Example:
slice_id,slice_description,metric_name,metric_value_current,metric_value_baseline,observation_window_start,observation_window_end,sample_size,notes
geo:us-east,US East datacenter primary region,p95_latency_ms,340,290,2026-05-01,2026-05-31,12500,canary deploy
geo:eu-west,EU West datacenter,p95_latency_ms,510,420,2026-05-01,2026-05-31,8700,higher tail
tenant:enterprise,Enterprise tier customers,success_rate,0.91,0.87,2026-05-01,2026-05-31,3200,top-3 accounts excluded for privacy
What this CSV is NOT:
**Canonical source:** `bdc-bridge-passport` repository at frozen SHA recorded in `PASSPORT_REPO_PIN.md`.