---
phase: "06"
status: passed
verified_date: "2026-03-23"
plans_verified: [06-01, 06-02]
requirements_covered: [OBS-01, OBS-02, OBS-03]
---

# Phase 06: kernel-observability — Verification Report

## Verification Method

Inline goal-backward verification against plan must_haves + automated test execution.

## Must-Haves Verification

### Plan 06-01 (dmesg_mark + classifier + parser)

| Must-have | Status | Evidence |
|-----------|--------|----------|
| `dmesg_mark` writes `vmcluster-marker-{uuid}` to `/dev/kmsg` | ✓ PASS | `insert_marker` runs `echo "{marker}" > /dev/kmsg`; tests/test_dmesg_mark.py::test_dmesg_mark_ssh_command_format |
| `dmesg_mark` returns dict mapping node name to marker string | ✓ PASS | Returns `ToolResult[dict[str, str]]`; test_dmesg_mark_all_nodes_returns_success |
| All nodes receive same marker (single UUID per call) | ✓ PASS | `marker = f"vmcluster-marker-{uuid.uuid4()}"` generated once; test_dmesg_mark_all_nodes_same_marker |
| `classify_line` orders: panic > oops > kasan > ubsan > warn > normal | ✓ PASS | Priority-ordered `_PATTERNS` list; test_classify_priority_ordering |
| `parse_dmesg_line` extracts priority, timestamp, facility, level, text | ✓ PASS | Decodes syslog priority byte; handles raw + ISO formats; 20 tests passing |

### Plan 06-02 (dmesg_collect)

| Must-have | Status | Evidence |
|-----------|--------|----------|
| `dmesg_collect` returns `DmesgResult` per node | ✓ PASS | Returns `ToolResult[dict[str, DmesgResult]]`; test_tool_dmesg_collect_returns_per_node_dict |
| Lines before `since_marker` excluded | ✓ PASS | Marker-index slicing in `collect_dmesg`; test_collect_marker_filters_before_marker |
| `filter_level='warn+'` includes warning/err/crit/alert/emerg only | ✓ PASS | Threshold=4; test_collect_filter_level_warn_plus |
| `filter_level='err+'` includes err/crit/alert/emerg only | ✓ PASS | Threshold=3; test_collect_filter_level_err_plus |
| Each `DmesgLine` has `classified_as` set | ✓ PASS | `classify_line()` called on every parsed line in `collect_dmesg` |
| `oops_detected` / `panic_detected` / counts derived from lines | ✓ PASS | test_collect_result_summary_fields |
| Missing marker → empty lines (not error) | ✓ PASS | Returns `DmesgResult(lines=[], ...)` when marker not found; test_collect_marker_not_found_returns_empty |
| Concurrent collection via `asyncio.gather` | ✓ PASS | `grep -c "asyncio.gather" observe/__init__.py` = 2; test_tool_dmesg_collect_ssh_failure_one_node_graceful |

## Automated Test Results

```
tests/test_classifier.py   20 passed
tests/test_dmesg_mark.py    9 passed
tests/test_dmesg_collect.py 17 passed
─────────────────────────────────────
Total phase 6:              46 passed

Full suite (274 tests): 274 passed — 0 regressions
```

## Requirement Coverage

| Req ID | Requirement | Status |
|--------|-------------|--------|
| OBS-01 | dmesg_mark inserts marker into /dev/kmsg | ✓ Implemented + tested |
| OBS-02 | dmesg_collect collects and parses dmesg output | ✓ Implemented + tested |
| OBS-03 | dmesg_collect filters by log level and marker | ✓ Implemented + tested |

## Summary

Phase 06 goal achieved. Both kernel observability MCP tools (`dmesg_mark`, `dmesg_collect`) are fully implemented, registered on the FastMCP server, and covered by 46 tests. No regressions in the prior 228-test suite.
