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Closes #832. ## Root cause confirmed \`trackedMB\` (\`s.trackedBytes\` in \`store.go\`) only sums per-packet struct + payload sizes recorded at insertion. It excludes the index maps (\`byHash\`, \`byTxID\`, \`byNode\`, \`byObserver\`, \`byPathHop\`, \`byPayloadType\`, hash-prefix maps, name lookups), the analytics LRUs (rfCache/topoCache/hashCache/distCache/subpathCache/chanCache/collisionCache), WS broadcast queues, and Go runtime overhead. It's \"useful packet bytes,\" not RSS — typically 3–5× off on staging. ## Fix (Option C from the issue) Expose four memory fields on \`/api/stats\` from a single cached snapshot: | Field | Source | Semantics | |---|---|---| | \`storeDataMB\` | \`s.trackedBytes\` | in-store packet bytes; eviction watermark input | | \`goHeapInuseMB\` | \`runtime.MemStats.HeapInuse\` | live Go heap | | \`goSysMB\` | \`runtime.MemStats.Sys\` | total Go-managed memory | | \`processRSSMB\` | \`/proc/self/status VmRSS\` (Linux), falls back to \`goSysMB\` | what the kernel sees | \`trackedMB\` is retained as a deprecated alias for \`storeDataMB\` so existing dashboards/QA scripts keep working. Field invariants are documented on \`MemorySnapshot\`: \`processRSSMB ≥ goSysMB ≥ goHeapInuseMB ≥ storeDataMB\` (typical). ## Performance Single \`getMemorySnapshot\` call cached for 1s — \`runtime.ReadMemStats\` (stop-the-world) and the \`/proc/self/status\` read are amortized across burst polling. \`/proc\` read is bounded to 8 KiB, parsed with \`strconv\` only — no shell-out, no untrusted input. \`cgoBytesMB\` is omitted: the build uses pure-Go \`modernc.org/sqlite\`, so there is no cgo allocator to measure. Documented in code comment. ## Tests \`cmd/server/stats_memory_test.go\` asserts presence, types, sign, and ordering invariants. Avoids the flaky \"matches RSS to ±X%\" pattern. \`\`\` $ go test ./... -count=1 -timeout 180s ok github.com/corescope/server 19.410s \`\`\` ## QA plan §1.4 now compares \`processRSSMB\` against procfs RSS (the right invariant); threshold stays at 0.20. --------- Co-authored-by: MeshCore Agent <meshcore-agent@openclaw.local>