wu-sheng opened a new pull request, #13791:
URL: https://github.com/apache/skywalking/pull/13791
### Support MCP (Model Context Protocol) observability for Envoy AI Gateway
- [x] If this is non-trivial feature, paste the links/URLs to the design doc.
- Extends
[SWIP-10](https://github.com/apache/skywalking/blob/master/docs/en/swip/SWIP-10/SWIP.md)
per [review
comment](https://github.com/apache/skywalking/pull/13757#discussion_r3000176157)
requesting MCP metrics support.
- MCP metrics defined in [envoyproxy/ai-gateway
mcp_metrics.go](https://github.com/envoyproxy/ai-gateway/blob/98200a4c0b06b4faa1750c0064b3b0506f0bfc15/internal/metrics/mcp_metrics.go#L23-L57).
- [x] Update the documentation to include this new feature.
- [x] Tests(including UT, IT, E2E) are added to verify the new feature.
- [ ] If it's UI related, attach the screenshots below.
#### Changes
**MAL rules** (new files):
- `gateway-mcp-service.yaml` — 13 MCP service-level metrics (request
CPM/latency/percentile, method CPM, error CPM, initialization latency,
capabilities, per-backend breakdown)
- `gateway-mcp-instance.yaml` — 13 MCP instance-level metrics
**LAL rules** (modified `envoy-ai-gateway.yaml`):
- Split into two rules: `envoy-ai-gateway-llm-access-log` and
`envoy-ai-gateway-mcp-access-log`
- LLM logs: persist error responses (>= 400) and upstream failures only
- MCP logs: persist error responses (>= 400) only
- Both rules tag `ai_route_type` (`llm` or `mcp`) for searchable filtering
**Dashboard** (modified service + instance JSON):
- Added **MCP** tab with 9 widgets (service) / 6 widgets (instance): request
CPM, latency avg/percentile, error CPM, method CPM, initialization latency,
backend breakdown
**E2E test** (modified):
- Added `mcp-server` service (`tzolov/mcp-everything-server:v3` — MCP
reference server with StreamableHttp)
- Added MCP request steps (initialize + tools/list + tools/call)
- Added MCP metric verification cases
- Log query uses `ai_route_type=llm` tag filter
**Config**:
- Added `ai_route_type` to `searchableLogsTags` in `application.yml`
- Fixed aigw healthcheck binary path (`/app` instead of `aigw`)
- [ ] If this pull request closes/resolves/fixes an existing issue, replace
the issue number. Closes #<issue number>.
- [x] Update the [`CHANGES`
log](https://github.com/apache/skywalking/blob/master/docs/en/changes/changes.md).
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