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+# Wave 8 — Observability + Streaming/Workflow
+
+**Survey date:** 2026-04-25
+**Tool:** unmoad (9 active MOAD detectors, HIGH+ severity filter)
+**Scope:** 10 observability and stream/workflow projects: jaeger (distributed tracing), opentelemetry-collector (OTel pipeline), fluent-bit + fluentd (log forwarders), vector (Rust observability data pipeline), tempo (Grafana traces), mimir (Grafana metrics), VictoriaMetrics (Go metrics TSDB), nsq (message queue), temporal (workflow engine).
+
+---
+
+## Summary
+
+Wave 8 totals 2,188 HIGH+ findings across 10 projects. **Four new clean-scan honor roll entries** (nsq, jaeger, opentelemetry-collector, temporal — all reduce to scanner false positives or build-time/test-only patterns under inspection). Honor roll cumulative: **34 projects** across waves 3-8.
+
+**No flagship CWE-407 patches ship this pass.** The strongest M1 candidate (VictoriaMetrics `streamaggr.getInputOutputLabels` — `slices.Contains` per label per sample) is real but constant-factor at realistic config shapes (`by`/`without` lists are typically 3-10 entries, below the CWE-407 wall-clock bar). Logged for future re-scan once configs grow.
+
+## Clean-scan honor roll — 4 new entries
+
+| Project | Lang | Role | Notes |
+|---------|------|------|-------|
+| **nsq** | Go | Distributed message queue | 4 findings, all FPs: `nsqadmin/static/js` String#includes vs Array#includes confusion + 1 test-fixture credential string. Tight Go core. |
+| **jaeger** | Go | Distributed tracing | 0 M1. M3 hits all in `internal/auth/*` and `internal/tenancy/*` — these are intentional ContextValue plumbing for tenant/auth propagation, the standard Go pattern for cross-cutting context, not "leaked context" defects. |
+| **opentelemetry-collector** | Go | OTel pipeline orchestrator | 9 M1 in `internal/cmd/pdatagen` — that is a build-time code generator, not a runtime path. Most M3 hits in `*_test.go`. |
+| **temporal** | Go | Workflow engine | 19 M1 mostly in test files / `cmd/tools/genrpcwrappers` (build-time). The single core finding `server_options.go:78` checks against fixed Services list (5 entries: frontend, history, matching, worker, internal-frontend). |
+
+Honor roll now stands at **34 projects** validated zero-real-finding under MOAD scanning.
+
+## Per-target findings
+
+| Project | Lang | Total | M1 | M3 | M4 | M5 | M6 | M7 | M9 | M11 | Triage |
+|---------|------|------:|---:|---:|---:|---:|---:|---:|---:|----:|--------|
+| fluent-bit | C | 1203 | 1055 | 7 | 72 | 1 | 14 | 41 | - | 13 | M1 dominated by msgpack JSON-key `strncmp` parsing (`processor_labels`, `kube_meta`, `cloudwatch_logs`, exporter modules). N here is "static labels" — typically 5-20 — bounded constant. |
+| vector | Rust | 262 | 121 | 1 | 14 | - | - | 125 | - | 1 | `windows_event_log/config.rs` query_lower.contains is config-time. `topology/running.rs` `reuse_buffers.contains` runs once at topology build. M7 cluster (125) worth a focused look but most are graph-build time. |
+| VictoriaMetrics | Go | 209 | 156 | 2 | 19 | 1 | - | 28 | 2 | 1 | UI vendored JS dominates (88 hits in `app/vmselect/vmui` + `vmalert/static`). Real candidate `streamaggr.go:1129/1137` — see investigation below. |
+| mimir | Go | 156 | 62 | 47 | 14 | - | - | 33 | - | - | UI vendored JS (`bootstrap-5.1.3.bundle.min.js`) accounts for 36. Core: `blocks_store_replicated_set.go` zone-bounded (3-9 zones); `codec.go` propagateHeaders bounded by config. |
+| temporal | Go | 99 | 19 | 49 | 14 | - | 1 | 1 | 15 | - | M3 cluster all `_test.go` ContextWithValue. Core M1 = fixed Services list. **clean** |
+| tempo | Go | 73 | 41 | - | 3 | - | - | 29 | - | - | UI vendored JS (36). `tracker.go:138/149` `t.sortedKeys` membership in usage tracking — bounded by tenant dimensions (typically <50). |
+| opentelemetry-collector | Go | 53 | 9 | 44 | - | - | - | - | - | - | M1 = build-time generator. M3 = test fixtures. **clean** |
+| jaeger | Go | 26 | - | 8 | 14 | 2 | - | 1 | - | 1 | Auth/tenancy ContextValue (intentional). M4 = "Authorization" in HTTP transport (intentional Bearer-token header). **clean** |
+| fluentd | Ruby | 103 | 70 | 27 | - | - | - | - | - | 6 | Ruby `Array#include?` clusters in plugin parsers; mostly bounded by directive shape. |
+| nsq | Go | 4 | 3 | - | 1 | - | - | - | - | - | All FPs (string vs array methods, test fixture). **clean** |
+
+## Investigation: VictoriaMetrics `streamaggr.getInputOutputLabels`
+
+`lib/streamaggr/streamaggr.go:1126` is called per time-series during stream aggregation. For each label in a sample, it calls `slices.Contains(without, label.Name)` (or `slices.Contains(by, label.Name)`) where `by`/`without` are user-configured label name lists.
+
+```go
+func getInputOutputLabels(dstInput, dstOutput, labels []prompb.Label, by, without []string) ([]prompb.Label, []prompb.Label) {
+    if len(without) > 0 {
+        for _, label := range labels {
+            if slices.Contains(without, label.Name) {  // O(W) per label
+                dstInput = append(dstInput, label)
+            } else {
+                dstOutput = append(dstOutput, label)
+            }
+        }
+    }
+    ...
+}
+```
+
+For L labels per sample and W `without` (or `by`) entries, total cost is O(L × W) per sample. At ingest rates of 1M+ samples/sec, this multiplies. Real but constant-factor: typical configs have W ≤ 10 and L ≤ 30, so the constant is 300 ops/sample. A `map[string]struct{}{}` would replace this with O(L) total via single hash per label.
+
+**Not patch-shipped.** At realistic config shapes the wall-clock impact is ~2-3× — below the CWE-407 bar of complexity-class change with measurable wall-clock impact (5× speedup at minimum). For users running label-heavy aggregations (W > 50), the patch would matter; we leave it logged for a re-scan once a real production case surfaces.
+
+## Triage backlog
+
+1. **VictoriaMetrics streamaggr** — re-scan if a real user reports W > 30 with high-cardinality ingest; the `set` patch is 5 lines and we have it on file.
+2. **fluentd Ruby plugin parsers** — `Array#include?` clusters in 70 hits worth a deeper Ruby-specific pass.
+3. **vector M7 cluster (125 hits)** — Flatland defect surface in topology graph build paths. Most likely topology-build-time but worth confirming by-file.
+4. **fluent-bit `processor_labels`** — bounded by static label count today; if Prometheus integrations push label count higher per metric, the linear `cfl_list_foreach` pattern becomes interesting.
+5. **mimir `propagateHeaders` configs** — if operators add many propagated headers per request, the per-request `slices.Contains` walk becomes measurable.
+
+## Method
+
+Same as Waves 3-7: shallow clone, `unmoad -s high -f json`, filter test/vendor/UI noise, manual triage of strongest source-only candidates per project. Four projects added to clean-scan honor roll. No new UNDF IDs assigned this wave (no patches shipped).
+
+## References
+
+- `unmoad` detection engine: `git.unturf.com/engineering/unmoad.com`
+- Earlier surveys: `/test-harness-survey/`, `/wave4-linter-ci-survey/`, `/wave5-cicd-iac-survey/`, `/wave6-docgen-webfw-tui-survey/`, `/docs-pipeline-survey/`, `/wave7-mail-dns-storage-vpn-rtos-survey/`
+- Clean-scan honor roll cumulative: 34 projects across waves 3-8