diff --git a/README.md b/README.md
index 8ba6b8d..ee4c3c8 100644
--- a/README.md
+++ b/README.md
@@ -31,9 +31,21 @@ flakes), all connected via Tailscale:
   Authentik SSO) on k3s, plus NixOS systemd services.
 - **Sifaka** (Synology NAS) - backup target and bulk storage.
 
-Notable services include Grafana/Prometheus/Loki observability, Immich photos,
-Jellyfin media, Forgejo git forge, a Zot container registry, and more. Public
-access is routed through a Fly.io proxy; everything else is tailnet-only.
+Notable services include Immich photos, Jellyfin media, Forgejo git forge, a
+Zot container registry, and more. Public access is routed through a Fly.io
+proxy; everything else is tailnet-only.
+
+### Observability stack
+
+The four(+) pillars of observability — metrics, logs, traces, and profiles —
+collected by Grafana Alloy and visualized in Grafana with cross-signal linking:
+
+| Pillar | Backend | How |
+|--------|---------|-----|
+| **Metrics** | Prometheus | Alloy scrape + remote_write |
+| **Logs** | Loki | Alloy pod log collection |
+| **Traces** | Tempo | Alloy Beyla eBPF auto-instrumentation |
+| **Profiles** | Pyroscope | Alloy eBPF continuous profiling |
 
 ## Project structure
 
diff --git a/argocd/apps/alloy-profiling-ringtail.yaml b/argocd/apps/alloy-profiling-ringtail.yaml
new file mode 100644
index 0000000..7f65782
--- /dev/null
+++ b/argocd/apps/alloy-profiling-ringtail.yaml
@@ -0,0 +1,17 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: alloy-profiling-ringtail
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: ssh://forgejo@forge.ops.eblu.me:2222/eblume/blumeops.git
+    targetRevision: main
+    path: argocd/manifests/alloy-profiling-ringtail
+  destination:
+    server: https://ringtail.tail8d86e.ts.net:6443
+    namespace: alloy
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true
diff --git a/argocd/apps/pyroscope.yaml b/argocd/apps/pyroscope.yaml
new file mode 100644
index 0000000..0019105
--- /dev/null
+++ b/argocd/apps/pyroscope.yaml
@@ -0,0 +1,17 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: pyroscope
+  namespace: argocd
+spec:
+  project: default
+  source:
+    repoURL: ssh://forgejo@forge.ops.eblu.me:2222/eblume/blumeops.git
+    targetRevision: main
+    path: argocd/manifests/pyroscope
+  destination:
+    server: https://ringtail.tail8d86e.ts.net:6443
+    namespace: pyroscope
+  syncPolicy:
+    syncOptions:
+      - CreateNamespace=true
diff --git a/argocd/manifests/alloy-profiling-ringtail/config.alloy b/argocd/manifests/alloy-profiling-ringtail/config.alloy
new file mode 100644
index 0000000..b9395c2
--- /dev/null
+++ b/argocd/manifests/alloy-profiling-ringtail/config.alloy
@@ -0,0 +1,73 @@
+// Alloy profiling configuration for ringtail
+// Uses pyroscope.ebpf to continuously profile workloads and export to Pyroscope
+
+// ============== KUBERNETES DISCOVERY ==============
+
+discovery.kubernetes "pods" {
+  role = "pod"
+}
+
+discovery.relabel "pods" {
+  targets = discovery.kubernetes.pods.targets
+
+  // Map container ID for pyroscope.ebpf (required label)
+  rule {
+    source_labels = ["__meta_kubernetes_pod_container_id"]
+    target_label  = "__container_id__"
+  }
+
+  // Build service_name from namespace/pod (required label)
+  rule {
+    source_labels = ["__meta_kubernetes_namespace", "__meta_kubernetes_pod_name"]
+    separator     = "/"
+    target_label  = "service_name"
+  }
+
+  // Keep namespace label
+  rule {
+    source_labels = ["__meta_kubernetes_namespace"]
+    target_label  = "namespace"
+  }
+
+  // Keep pod name label
+  rule {
+    source_labels = ["__meta_kubernetes_pod_name"]
+    target_label  = "pod"
+  }
+
+  // Keep container name label
+  rule {
+    source_labels = ["__meta_kubernetes_pod_container_name"]
+    target_label  = "container"
+  }
+
+  // Drop infrastructure namespaces
+  rule {
+    source_labels = ["namespace"]
+    regex         = "kube-system|tailscale"
+    action        = "drop"
+  }
+
+  // Drop alloy pods to avoid self-profiling noise
+  rule {
+    source_labels = ["__meta_kubernetes_pod_label_app"]
+    regex         = "alloy|alloy-tracing|alloy-profiling"
+    action        = "drop"
+  }
+}
+
+// ============== eBPF PROFILING ==============
+
+pyroscope.ebpf "instance" {
+  forward_to = [pyroscope.write.endpoint.receiver]
+  targets    = discovery.relabel.pods.output
+  demangle   = "none"
+}
+
+// ============== PYROSCOPE WRITE ==============
+
+pyroscope.write "endpoint" {
+  endpoint {
+    url = "http://pyroscope.pyroscope.svc.cluster.local:4040"
+  }
+}
diff --git a/argocd/manifests/alloy-profiling-ringtail/daemonset.yaml b/argocd/manifests/alloy-profiling-ringtail/daemonset.yaml
new file mode 100644
index 0000000..6c8b09a
--- /dev/null
+++ b/argocd/manifests/alloy-profiling-ringtail/daemonset.yaml
@@ -0,0 +1,72 @@
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: alloy-profiling
+  namespace: alloy
+  labels:
+    app: alloy-profiling
+spec:
+  selector:
+    matchLabels:
+      app: alloy-profiling
+  template:
+    metadata:
+      labels:
+        app: alloy-profiling
+    spec:
+      serviceAccountName: alloy-profiling
+      hostPID: true
+      containers:
+        - name: alloy
+          image: registry.ops.eblu.me/blumeops/alloy:kustomized
+          args:
+            - run
+            - --server.http.listen-addr=0.0.0.0:12347
+            - --storage.path=/var/lib/alloy/data
+            - /etc/alloy/config.alloy
+          ports:
+            - containerPort: 12347
+              name: http
+          env:
+            - name: HOSTNAME
+              valueFrom:
+                fieldRef:
+                  fieldPath: spec.nodeName
+          resources:
+            requests:
+              cpu: 100m
+              memory: 256Mi
+            limits:
+              cpu: "1"
+              memory: 1Gi
+          volumeMounts:
+            - name: config
+              mountPath: /etc/alloy
+            - name: data
+              mountPath: /var/lib/alloy/data
+            - name: tmp
+              mountPath: /tmp
+            - name: host-proc
+              mountPath: /host/proc
+              readOnly: true
+            - name: host-sys
+              mountPath: /host/sys
+              readOnly: true
+          securityContext:
+            privileged: true
+      tolerations:
+        - operator: Exists
+      volumes:
+        - name: config
+          configMap:
+            name: alloy-profiling-config
+        - name: data
+          emptyDir: {}
+        - name: tmp
+          emptyDir: {}
+        - name: host-proc
+          hostPath:
+            path: /proc
+        - name: host-sys
+          hostPath:
+            path: /sys
diff --git a/argocd/manifests/alloy-profiling-ringtail/kustomization.yaml b/argocd/manifests/alloy-profiling-ringtail/kustomization.yaml
new file mode 100644
index 0000000..76af63f
--- /dev/null
+++ b/argocd/manifests/alloy-profiling-ringtail/kustomization.yaml
@@ -0,0 +1,17 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: alloy
+
+resources:
+  - rbac.yaml
+  - daemonset.yaml
+
+images:
+  - name: registry.ops.eblu.me/blumeops/alloy
+    newTag: v1.14.0-fd0bebb-nix
+
+configMapGenerator:
+  - name: alloy-profiling-config
+    files:
+      - config.alloy
diff --git a/argocd/manifests/alloy-profiling-ringtail/rbac.yaml b/argocd/manifests/alloy-profiling-ringtail/rbac.yaml
new file mode 100644
index 0000000..5b0bb04
--- /dev/null
+++ b/argocd/manifests/alloy-profiling-ringtail/rbac.yaml
@@ -0,0 +1,30 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: alloy-profiling
+  namespace: alloy
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: alloy-profiling
+rules:
+  - apiGroups: [""]
+    resources: ["pods", "services", "endpoints", "nodes", "namespaces"]
+    verbs: ["get", "list", "watch"]
+  - apiGroups: ["apps"]
+    resources: ["deployments", "replicasets", "statefulsets", "daemonsets"]
+    verbs: ["get", "list", "watch"]
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: alloy-profiling
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: alloy-profiling
+subjects:
+  - kind: ServiceAccount
+    name: alloy-profiling
+    namespace: alloy
diff --git a/argocd/manifests/grafana/datasources.yaml b/argocd/manifests/grafana/datasources.yaml
index 5a3d0f3..286bbf0 100644
--- a/argocd/manifests/grafana/datasources.yaml
+++ b/argocd/manifests/grafana/datasources.yaml
@@ -48,6 +48,19 @@ datasources:
       datasourceUid: prometheus
     nodeGraph:
       enabled: true
+    tracesToProfilesV2:
+      datasourceUid: pyroscope
+      customQuery: false
+- access: proxy
+  editable: false
+  name: Pyroscope
+  orgId: 1
+  type: grafana-pyroscope-datasource
+  uid: pyroscope
+  url: https://pyroscope.tail8d86e.ts.net
+  jsonData:
+    backendType: pyroscope
+    tlsSkipVerify: true
 - access: proxy
   database: teslamate
   editable: false
diff --git a/argocd/manifests/pyroscope/config.yaml b/argocd/manifests/pyroscope/config.yaml
new file mode 100644
index 0000000..cc1a136
--- /dev/null
+++ b/argocd/manifests/pyroscope/config.yaml
@@ -0,0 +1,13 @@
+storage:
+  backend: filesystem
+  filesystem:
+    dir: /data
+
+compactor:
+  compaction_interval: 30m
+
+limits:
+  max_query_lookback: 168h
+
+self_profiling:
+  disable_push: true
diff --git a/argocd/manifests/pyroscope/ingress-tailscale.yaml b/argocd/manifests/pyroscope/ingress-tailscale.yaml
new file mode 100644
index 0000000..4384def
--- /dev/null
+++ b/argocd/manifests/pyroscope/ingress-tailscale.yaml
@@ -0,0 +1,26 @@
+# Tailscale Ingress for Pyroscope query API
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: pyroscope-tailscale
+  namespace: pyroscope
+  annotations:
+    tailscale.com/funnel: "false"
+    tailscale.com/proxy-group: "ingress"
+    tailscale.com/tags: "tag:k8s"
+    gethomepage.dev/enabled: "false"
+spec:
+  ingressClassName: tailscale
+  rules:
+    - http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: pyroscope
+                port:
+                  number: 4040
+  tls:
+    - hosts:
+        - pyroscope
diff --git a/argocd/manifests/pyroscope/kustomization.yaml b/argocd/manifests/pyroscope/kustomization.yaml
new file mode 100644
index 0000000..f8db2c6
--- /dev/null
+++ b/argocd/manifests/pyroscope/kustomization.yaml
@@ -0,0 +1,20 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: pyroscope
+
+resources:
+  - namespace.yaml
+  - statefulset.yaml
+  - service.yaml
+  - ingress-tailscale.yaml
+
+images:
+  - name: grafana/pyroscope
+    newName: registry.ops.eblu.me/blumeops/pyroscope
+    newTag: "v1.19.1-a269bd6-nix"
+
+configMapGenerator:
+  - name: pyroscope-config
+    files:
+      - config.yaml
diff --git a/argocd/manifests/pyroscope/namespace.yaml b/argocd/manifests/pyroscope/namespace.yaml
new file mode 100644
index 0000000..a96c46f
--- /dev/null
+++ b/argocd/manifests/pyroscope/namespace.yaml
@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: pyroscope
diff --git a/argocd/manifests/pyroscope/service.yaml b/argocd/manifests/pyroscope/service.yaml
new file mode 100644
index 0000000..ccb0dc2
--- /dev/null
+++ b/argocd/manifests/pyroscope/service.yaml
@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: pyroscope
+  namespace: pyroscope
+spec:
+  selector:
+    app: pyroscope
+  ports:
+    - name: http
+      port: 4040
+      targetPort: 4040
+  type: ClusterIP
diff --git a/argocd/manifests/pyroscope/statefulset.yaml b/argocd/manifests/pyroscope/statefulset.yaml
new file mode 100644
index 0000000..e31414b
--- /dev/null
+++ b/argocd/manifests/pyroscope/statefulset.yaml
@@ -0,0 +1,66 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pyroscope
+  namespace: pyroscope
+spec:
+  serviceName: pyroscope
+  replicas: 1
+  selector:
+    matchLabels:
+      app: pyroscope
+  template:
+    metadata:
+      labels:
+        app: pyroscope
+    spec:
+      securityContext:
+        fsGroup: 10001
+        runAsNonRoot: true
+        runAsUser: 10001
+        seccompProfile:
+          type: RuntimeDefault
+      containers:
+        - name: pyroscope
+          image: grafana/pyroscope:kustomized
+          args:
+            - -config.file=/etc/pyroscope/config.yaml
+          ports:
+            - name: http
+              containerPort: 4040
+          volumeMounts:
+            - name: config
+              mountPath: /etc/pyroscope
+            - name: data
+              mountPath: /data
+          resources:
+            requests:
+              memory: "256Mi"
+              cpu: "100m"
+            limits:
+              memory: "2Gi"
+              cpu: "500m"
+          livenessProbe:
+            httpGet:
+              path: /ready
+              port: 4040
+            initialDelaySeconds: 45
+            periodSeconds: 10
+          readinessProbe:
+            httpGet:
+              path: /ready
+              port: 4040
+            initialDelaySeconds: 10
+            periodSeconds: 5
+      volumes:
+        - name: config
+          configMap:
+            name: pyroscope-config
+  volumeClaimTemplates:
+    - metadata:
+        name: data
+      spec:
+        accessModes: ["ReadWriteOnce"]
+        resources:
+          requests:
+            storage: 10Gi
diff --git a/containers/pyroscope/default.nix b/containers/pyroscope/default.nix
new file mode 100644
index 0000000..950d0bb
--- /dev/null
+++ b/containers/pyroscope/default.nix
@@ -0,0 +1,161 @@
+# Nix-built Grafana Pyroscope continuous profiling server
+# Builds v1.19.1 from forge mirror
+# Uses stdenv + make (not buildGoModule) due to multi-module go.work workspace
+# with local replace directives (./api, ./lidia)
+# Built with dockerTools.buildLayeredImage for efficient layer caching
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  version = "1.19.1";
+
+  src = pkgs.fetchgit {
+    url = "https://forge.ops.eblu.me/mirrors/pyroscope.git";
+    rev = "v${version}";
+    hash = "sha256-UPxGimkzXLFACqmAM1hNQIoNjN6OquVibwVmNvP00+s=";
+  };
+
+  # Build frontend assets via yarn + webpack (upstream uses Docker for this)
+  # mkYarnPackage symlinks node_modules from the Nix store, but webpack's
+  # CopyPlugin can't follow symlinks for glob patterns. We dereference the
+  # @grafana/ui icons directory before running the build.
+  ui = pkgs.mkYarnPackage {
+    inherit version src;
+    pname = "pyroscope-ui";
+
+    buildPhase = ''
+      runHook preBuild
+      export HOME=$TMPDIR
+      cd deps/grafana-pyroscope
+
+      # mkYarnPackage symlinks node_modules into the Nix store (read-only).
+      # Webpack CopyPlugin can't glob through these symlinks to find
+      # @grafana/ui icons. Pre-copy them to the output location and patch
+      # webpack to skip the CopyPlugin entry for icons.
+      mkdir -p public/build/grafana/build/img
+      cp -rL ../../node_modules/@grafana/ui/dist/public/img/icons \
+        public/build/grafana/build/img/
+
+      # Rewrite the CopyPlugin icons path to point at our pre-copied location
+      # instead of the symlinked node_modules path that webpack can't glob
+      sed -i "s|from: 'node_modules/@grafana/ui/dist/public/img/icons'|from: 'public/build/grafana/build/img/icons'|" \
+        scripts/webpack/webpack.common.js
+
+      yarn --offline build
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      runHook preInstall
+      mkdir -p $out
+      cp -r public/build/* $out/
+      runHook postInstall
+    '';
+
+    distPhase = "true";
+  };
+
+  # Pre-fetch Go modules for all go.mod files in the workspace (fixed-output derivation)
+  goModules = pkgs.stdenv.mkDerivation {
+    pname = "pyroscope-go-modules";
+    inherit src version;
+
+    nativeBuildInputs = with pkgs; [ go git cacert ];
+
+    buildPhase = ''
+      export GOPATH=$TMPDIR/go
+      export GOFLAGS=-modcacherw
+      # Download modules for all workspace members
+      go mod download
+      cd api && go mod download && cd ..
+      cd lidia && go mod download && cd ..
+    '';
+
+    installPhase = ''
+      cp -r $TMPDIR/go/pkg/mod $out
+    '';
+
+    # Disable fixup: patchelf and patchShebangs modify downloaded Go toolchain
+    # binaries, which makes the fixed-output derivation reference store paths
+    dontFixup = true;
+
+    outputHashMode = "recursive";
+    outputHash = "sha256-RCWuqz1XaDrS7+GqL/9v7LNA14M4/ohWEtPeTMDkJFc=";
+    outputHashAlgo = "sha256";
+  };
+
+  pyroscope = pkgs.stdenv.mkDerivation {
+    inherit src version;
+    pname = "pyroscope";
+
+    nativeBuildInputs = with pkgs; [
+      go
+      git
+      gnumake
+      cacert
+    ];
+
+    buildPhase = ''
+      runHook preBuild
+
+      export HOME=$TMPDIR
+      export GOPATH=$TMPDIR/go
+      export GOFLAGS=-modcacherw
+
+      # Populate module cache from pre-fetched modules
+      mkdir -p $GOPATH/pkg
+      cp -r ${goModules} $GOPATH/pkg/mod
+      chmod -R u+w $GOPATH/pkg/mod
+
+      # Copy pre-built frontend assets
+      mkdir -p public/build
+      cp -r ${ui}/* public/build/
+
+      # Build Go binary with embedded frontend assets
+      # Skip the Makefile's frontend/build target (uses Docker) and
+      # invoke go/bin directly with EMBEDASSETS set
+      # CGO_ENABLED=0 for static binary (matches upstream)
+      CGO_ENABLED=0 \
+        EMBEDASSETS=embedassets \
+        IMAGE_TAG=v${version} \
+        make go/bin
+
+      runHook postBuild
+    '';
+
+    installPhase = ''
+      runHook preInstall
+      mkdir -p $out/bin
+      cp pyroscope $out/bin/pyroscope
+      runHook postInstall
+    '';
+
+    meta = with pkgs.lib; {
+      description = "Grafana Pyroscope continuous profiling platform";
+      homepage = "https://grafana.com/docs/pyroscope/";
+      license = licenses.agpl3Only;
+      mainProgram = "pyroscope";
+    };
+  };
+in
+
+pkgs.dockerTools.buildLayeredImage {
+  name = "blumeops/pyroscope";
+  contents = [
+    pyroscope
+    pkgs.cacert
+    pkgs.tzdata
+  ];
+
+  config = {
+    Entrypoint = [ "${pyroscope}/bin/pyroscope" ];
+    Cmd = [ "-config.file=/etc/pyroscope/config.yaml" ];
+    Env = [
+      "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
+      "TZDIR=${pkgs.tzdata}/share/zoneinfo"
+    ];
+    ExposedPorts = {
+      "4040/tcp" = { };
+    };
+    User = "65534";
+  };
+}
diff --git a/docs/changelog.d/feature-pyroscope-profiling.feature.md b/docs/changelog.d/feature-pyroscope-profiling.feature.md
new file mode 100644
index 0000000..0d429fe
--- /dev/null
+++ b/docs/changelog.d/feature-pyroscope-profiling.feature.md
@@ -0,0 +1 @@
+Deploy Grafana Pyroscope on ringtail for continuous eBPF profiling, with Alloy collection agent and Grafana cross-signal linking.
diff --git a/docs/reference/kubernetes/apps.md b/docs/reference/kubernetes/apps.md
index 02215fc..db9baca 100644
--- a/docs/reference/kubernetes/apps.md
+++ b/docs/reference/kubernetes/apps.md
@@ -1,6 +1,6 @@
 ---
 title: Apps
-modified: 2026-03-04
+modified: 2026-03-26
 tags:
   - kubernetes
   - argocd
@@ -30,6 +30,8 @@ Registry of all applications deployed via [[argocd]].
 | `tempo` | monitoring | `argocd/manifests/tempo/` | [[tempo]] |
 | `alloy-k8s` | alloy | `argocd/manifests/alloy-k8s/` | [[alloy|Alloy]] |
 | `alloy-tracing-ringtail` | alloy | `argocd/manifests/alloy-tracing-ringtail/` | [[alloy|Alloy]] (eBPF tracing) |
+| `alloy-profiling-ringtail` | alloy | `argocd/manifests/alloy-profiling-ringtail/` | [[alloy|Alloy]] (eBPF profiling) |
+| `pyroscope` | pyroscope | `argocd/manifests/pyroscope/` | [[pyroscope]] |
 | `kube-state-metrics` | monitoring | `argocd/manifests/kube-state-metrics/` | K8s metrics |
 | `miniflux` | miniflux | `argocd/manifests/miniflux/` | [[miniflux]] |
 | `kiwix` | kiwix | `argocd/manifests/kiwix/` | [[kiwix]] |
diff --git a/docs/reference/operations/observability.md b/docs/reference/operations/observability.md
index 35136d5..e136fb6 100644
--- a/docs/reference/operations/observability.md
+++ b/docs/reference/operations/observability.md
@@ -1,21 +1,30 @@
 ---
 title: Observability
-modified: 2026-03-22
+modified: 2026-03-26
 tags:
   - operations
 ---
 
 # Observability
 
-Metrics, logs, traces, and dashboards for BlumeOps infrastructure.
+The four(+) pillars of observability — metrics, logs, traces, and profiles — collected and visualized via the Grafana ecosystem.
 
 ## Components
 
-- [[prometheus]] - Metrics storage and querying
-- [[loki]] - Log aggregation
-- [[tempo]] - Distributed tracing
-- [[alloy|Alloy]] - Metrics, log, and trace collection
-- [[grafana]] - Dashboards and visualization
+| Pillar | Backend | Collector | Cluster |
+|--------|---------|-----------|---------|
+| **Metrics** | [[prometheus]] | [[alloy]] | indri |
+| **Logs** | [[loki]] | [[alloy]] | indri |
+| **Traces** | [[tempo]] | [[alloy]] (Beyla eBPF) | indri (backend), ringtail (collection) |
+| **Profiles** | [[pyroscope]] | [[alloy]] (pyroscope.ebpf) | ringtail |
+
+All four are visualized in [[grafana]] with cross-signal linking (traces → logs, traces → profiles, traces → metrics).
+
+## Future: Frontend Monitoring (RUM)
+
+Grafana Faro is a Real User Monitoring SDK that captures page loads, web vitals, errors, and network timings from the browser, feeding into Loki (logs) and Tempo (traces) via Alloy's `faro.receiver` component. This would add an "outside-in" view of service health from the user's perspective.
+
+**Not currently deployed.** RUM captures browsing behavior from visitors to public services, creating a data retention liability. Would require careful sanitization before deploying.
 
 ## Alerting
 
diff --git a/docs/reference/services/alloy.md b/docs/reference/services/alloy.md
index d781f2f..d62b638 100644
--- a/docs/reference/services/alloy.md
+++ b/docs/reference/services/alloy.md
@@ -1,6 +1,6 @@
 ---
 title: Alloy
-modified: 2026-03-13
+modified: 2026-03-26
 tags:
   - service
   - observability
@@ -8,10 +8,12 @@ tags:
 
 # Grafana Alloy
 
-Unified observability collector for metrics and logs with three deployments:
+Unified observability collector for metrics, logs, traces, and profiles with five deployments:
 1. **Indri (host)** - System metrics and service logs from macOS host
 2. **Kubernetes (DaemonSet)** - Automatic pod log collection and service health probes
 3. **Fly.io proxy (embedded)** - nginx access log metrics and log forwarding from [[flyio-proxy]]
+4. **Ringtail tracing (DaemonSet)** - Beyla eBPF auto-instrumentation for HTTP traces
+5. **Ringtail profiling (DaemonSet)** - `pyroscope.ebpf` continuous CPU profiling
 
 ## Quick Reference
 
@@ -64,4 +66,7 @@ The Homebrew bottle uses `CGO_ENABLED=0`, which breaks Tailscale MagicDNS. Build
 
 - [[prometheus]] - Metrics storage
 - [[loki]] - Log storage
+- [[tempo]] - Trace storage
+- [[pyroscope]] - Profile storage
 - [[grafana]] - Visualization
+- [[observability]] - Full stack overview
diff --git a/docs/reference/services/grafana.md b/docs/reference/services/grafana.md
index 3a9ae01..e5e038c 100644
--- a/docs/reference/services/grafana.md
+++ b/docs/reference/services/grafana.md
@@ -1,6 +1,6 @@
 ---
 title: Grafana
-modified: 2026-02-28
+modified: 2026-03-26
 tags:
   - service
   - observability
@@ -37,6 +37,7 @@ The OIDC client secret is injected via [[external-secrets]] (`grafana-authentik-
 | Prometheus | prometheus | `prometheus.monitoring.svc.cluster.local:9090` |
 | Loki | loki | `loki.monitoring.svc.cluster.local:3100` |
 | Tempo | tempo | `tempo.monitoring.svc.cluster.local:3200` |
+| Pyroscope | grafana-pyroscope-datasource | `pyroscope.tail8d86e.ts.net` (ringtail, via Tailscale) |
 | TeslaMate | postgres | `blumeops-pg-rw.databases.svc.cluster.local:5432` |
 
 ## Dashboard Provisioning
diff --git a/docs/reference/services/pyroscope.md b/docs/reference/services/pyroscope.md
new file mode 100644
index 0000000..927d1b7
--- /dev/null
+++ b/docs/reference/services/pyroscope.md
@@ -0,0 +1,50 @@
+---
+title: Pyroscope
+modified: 2026-03-26
+tags:
+  - service
+  - observability
+---
+
+# Grafana Pyroscope
+
+Continuous profiling backend for BlumeOps. Stores CPU profiles collected by Alloy's eBPF profiler on ringtail, providing function-level visibility into where compute time is spent.
+
+## Quick Reference
+
+| Property | Value |
+|----------|-------|
+| **URL** | https://pyroscope.tail8d86e.ts.net |
+| **Namespace** | `pyroscope` |
+| **Cluster** | ringtail (k3s) |
+| **Deployment** | StatefulSet (`argocd/manifests/pyroscope/`) |
+| **Image** | `grafana/pyroscope` |
+| **Port** | 4040 |
+| **Storage** | 10Gi PVC at `/data` |
+| **Retention** | 7 days (`max_query_lookback: 168h`) |
+
+## Architecture
+
+Pyroscope runs on ringtail because eBPF profiling requires Linux. Grafana on indri queries it via Tailscale Ingress.
+
+```
+Alloy (pyroscope.ebpf on ringtail) → Pyroscope (ringtail) → Grafana (indri, via Tailscale)
+```
+
+## Collection
+
+Profiles are collected by the `alloy-profiling-ringtail` DaemonSet, which runs the `pyroscope.ebpf` component in privileged mode with `hostPID: true`. It discovers Kubernetes pods automatically and excludes infrastructure namespaces (`kube-system`, `tailscale`) and Alloy pods.
+
+The eBPF profiler works without application instrumentation — it samples CPU stack traces from the kernel, covering native code (Go, C/C++), interpreted languages (Python, Ruby, Node.js), and JIT-compiled runtimes (.NET).
+
+**Limitations:**
+- GPU workloads (e.g., Frigate inference via CUDA) are invisible to CPU profiling
+- Stripped binaries (no debug symbols) produce opaque stack frames
+- Python frame quality varies depending on runtime version
+
+## Related
+
+- [[alloy]] - Collection agent
+- [[observability]] - Full observability stack overview
+- [[grafana]] - Visualization
+- [[tempo]] - Distributed tracing (cross-linked via traces-to-profiles)
diff --git a/service-versions.yaml b/service-versions.yaml
index 909aa8c..8580525 100644
--- a/service-versions.yaml
+++ b/service-versions.yaml
@@ -285,6 +285,20 @@ services:
     upstream-source: https://github.com/prowler-cloud/prowler/releases
     notes: CIS Kubernetes Benchmark scanner; weekly CronJob on minikube-indri
 
+  - name: pyroscope
+    type: argocd
+    last-reviewed: 2026-03-26
+    current-version: "v1.19.1"
+    upstream-source: https://github.com/grafana/pyroscope/releases
+    notes: Nix-built container on ringtail; continuous profiling backend
+
+  - name: alloy-profiling-ringtail
+    type: argocd
+    last-reviewed: 2026-03-26
+    current-version: "v1.14.0"
+    upstream-source: https://github.com/grafana/alloy/releases
+    notes: Privileged DaemonSet with pyroscope.ebpf for CPU profiling on ringtail
+
   - name: forgejo
     type: ansible
     last-reviewed: 2026-02-22