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+# P6.2 Peer Discovery Implementation Verification
+
+## Summary
+
+Verified that peer discovery per plan §14.5 is fully implemented:
+
+### 1. Helm Templates ✓
+- `charts/miroir/templates/miroir-headless.yaml` - Headless Service with label selector
+- `charts/miroir/templates/miroir-deployment.yaml` - POD_NAME, POD_NAMESPACE, POD_IP env vars via Downward API
+
+### 2. Rust Implementation ✓
+- `crates/miroir-core/src/peer_discovery.rs` - SRV-based peer discovery module
+  - `PeerSet` struct with `peers: Vec<PeerId>` and `refreshed_at: Instant`
+  - `PeerDiscovery::refresh()` method for SRV lookup
+  - Feature flag: `peer-discovery` (uses `trust-dns-resolver`)
+
+### 3. Configuration ✓
+- `crates/miroir-core/src/config.rs` - `PeerDiscoveryConfig` struct
+  - `service_name: "miroir-headless"` (default)
+  - `refresh_interval_s: 15` (default)
+- `charts/miroir/values.yaml` - Config section with same defaults
+
+### 4. Main Loop Integration ✓
+- `crates/miroir-proxy/src/main.rs` (lines 407-438)
+  - Creates `PeerDiscovery` instance when POD_NAME is set
+  - Spawns background refresh loop with configurable interval
+  - Calls `metrics.set_peer_pod_count(count)` on successful refresh
+
+### 5. Metrics ✓
+- `crates/miroir-proxy/src/middleware.rs` (line 823-825, 1582-1584)
+  - `miroir_peer_pod_count` gauge metric
+  - `miroir_leader` gauge metric
+  - `miroir_owned_shards_count` gauge metric
+
+### 6. Verification Script ✓
+- `tests/verify_p6_2_peer_discovery.sh` - Checks metrics and env vars
+  - Shebang: `#!/usr/bin/env bash` (NixOS compatible)
+
+## Acceptance Tests (require K8s environment)
+
+The following acceptance tests require a real Kubernetes deployment:
+
+1. **3-pod deployment**: Each pod sees all 3 peer names within 30s of last pod ready
+2. **Scale 3→5**: New peers discovered within `refresh_interval_s × 2`
+3. **Pod eviction**: Crashed pod drops from peer set within `refresh_interval_s × 2`
+4. **Metric verification**: `miroir_peer_pod_count` matches `kube_deployment_status_replicas_ready`
+
+## Unit Tests
+
+All peer discovery unit tests pass:
+- `test_peer_set_empty` ✓
+- `test_peer_set_with_peers` ✓
+- `test_srv_target_pod_name_extraction` ✓
+
+## Implementation Notes
+
+- The peer discovery implementation was already complete in the codebase
+- No code changes were required - this task was verification-only
+- The `peer-discovery` feature flag must be enabled for SRV lookups to work
+- Peer discovery automatically disables when `POD_NAME=unknown` (local dev)
+
+## Plan §14.5 Alignment
+
+Fully implements plan §14.5 "Peer discovery" with:
+- Headless Service SRV lookup mechanism
+- 15-second refresh interval (configurable)
+- Zero-config operation (uses Downward API env vars)
+- No K8s API calls from pods
+- Transient double-work is acceptable (idempotent operations)