diff --git a/packages/oyasai-alloy.nix b/packages/oyasai-alloy.nix
new file mode 100644
index 000000000..f55105d6f
--- /dev/null
+++ b/packages/oyasai-alloy.nix
@@ -0,0 +1,60 @@
+{
+  lib,
+  grafana-alloy,
+  oyasaiDockerTools,
+  stdenv,
+  writeTextFile,
+}:
+
+let
+  alloyConfig = writeTextFile {
+    name = "config.alloy";
+    text = ''
+      // Discover all Docker containers via the Docker socket.
+      discovery.docker "all" {
+        host = "unix:///var/run/docker.sock"
+      }
+
+      // Relabel: expose container name and log stream as Loki labels.
+      discovery.relabel "containers" {
+        targets = discovery.docker.all.targets
+
+        rule {
+          source_labels = ["__meta_docker_container_name"]
+          regex         = "/(.*)"
+          target_label  = "container"
+        }
+
+        rule {
+          source_labels = ["__meta_docker_container_log_stream"]
+          target_label  = "stream"
+        }
+      }
+
+      // Tail logs from Docker containers and forward to Loki.
+      loki.source.docker "all" {
+        host       = "unix:///var/run/docker.sock"
+        targets    = discovery.relabel.containers.output
+        forward_to = [loki.write.default.receiver]
+      }
+
+      loki.write "default" {
+        endpoint {
+          url = "http://loki:3100/loki/api/v1/push"
+        }
+      }
+    '';
+  };
+in
+lib.optionalAttrs stdenv.hostPlatform.isLinux {
+  docker = oyasaiDockerTools.buildLayeredImage {
+    name = "oyasai-alloy";
+    config = {
+      Cmd = [
+        "${grafana-alloy}/bin/alloy"
+        "run"
+        "${alloyConfig}"
+      ];
+    };
+  };
+}
diff --git a/packages/oyasai-cdktf/src/stacks/platform-services.ts b/packages/oyasai-cdktf/src/stacks/platform-services.ts
index e99900761..496d1ebaf 100644
--- a/packages/oyasai-cdktf/src/stacks/platform-services.ts
+++ b/packages/oyasai-cdktf/src/stacks/platform-services.ts
@@ -50,12 +50,17 @@ export class PlatformServices extends OyasaiPlatformTerraformStack {
     const imageIds = JSON.parse(process.env.OYASAI_IMAGE_ID as string);
     const images = {
       // keep-sorted start
+      alloy: imageIds["oyasai-alloy"],
+      grafana: imageIds["oyasai-grafana"],
+      loki: imageIds["oyasai-loki"],
       mariadb: imageIds.mariadb,
+      mcMonitorExporter: imageIds["oyasai-mc-monitor-exporter"],
       minecraftAxiom: imageIds["oyasai-minecraft-axiom"],
       minecraftBackup: imageIds["mc-backup"],
       minecraftLobby: imageIds["oyasai-minecraft-lobby"],
       minecraftMain: imageIds["oyasai-minecraft-main"],
       mysqlBackup: imageIds["mysql-backup"],
+      prometheus: imageIds["oyasai-prometheus"],
       velocity: imageIds["oyasai-velocity"],
       // keep-sorted end
     } as const;
@@ -63,10 +68,12 @@ export class PlatformServices extends OyasaiPlatformTerraformStack {
     const baseHostPath = join("/opt/platform", this.environment);
     const hostPaths = {
       // keep-sorted start
+      loki: join(baseHostPath, "loki"),
       mariadb: join(baseHostPath, "mariadb"),
       minecraftAxiom: join(baseHostPath, "minecraft-axiom"),
       minecraftLobby: join(baseHostPath, "minecraft-lobby"),
       minecraftMain: join(baseHostPath, "minecraft-main"),
+      prometheus: join(baseHostPath, "prometheus"),
       velocity: join(baseHostPath, "velocity"),
       // keep-sorted end
     } as const;
@@ -290,5 +297,65 @@ export class PlatformServices extends OyasaiPlatformTerraformStack {
         }),
       });
     }
+
+    new Container(this, this.t("mc-monitor-exporter-container"), {
+      image: images.mcMonitorExporter,
+      name: "mc-monitor-exporter",
+      restart: "unless-stopped",
+      networksAdvanced: [network],
+      env: envs({
+        EXPORT_SERVERS: [
+          `${minecraftMainContainer.name}:25565`,
+          `${minecraftLobbyContainer.name}:25565`,
+        ].join(","),
+      }),
+    });
+
+    new Container(this, this.t("loki-container"), {
+      image: images.loki,
+      name: "loki",
+      restart: "unless-stopped",
+      networksAdvanced: [network],
+      volumes: [
+        {
+          containerPath: "/data",
+          hostPath: hostPaths.loki,
+        },
+      ],
+    });
+
+    new Container(this, this.t("alloy-container"), {
+      image: images.alloy,
+      name: "alloy",
+      restart: "unless-stopped",
+      networksAdvanced: [network],
+      volumes: [
+        {
+          containerPath: "/var/run/docker.sock",
+          hostPath: "/var/run/docker.sock",
+        },
+      ],
+    });
+
+    new Container(this, this.t("prometheus-container"), {
+      image: images.prometheus,
+      name: "prometheus",
+      restart: "unless-stopped",
+      networksAdvanced: [network],
+      volumes: [
+        {
+          containerPath: "/data",
+          hostPath: hostPaths.prometheus,
+        },
+      ],
+    });
+
+    new Container(this, this.t("grafana-container"), {
+      image: images.grafana,
+      name: "grafana",
+      restart: "unless-stopped",
+      networksAdvanced: [network],
+      ports: ports({ tcp: [3000] }),
+    });
   }
 }
diff --git a/packages/oyasai-grafana/oyasai-grafana-dashboard.json b/packages/oyasai-grafana/oyasai-grafana-dashboard.json
new file mode 100644
index 000000000..252a0478c
--- /dev/null
+++ b/packages/oyasai-grafana/oyasai-grafana-dashboard.json
@@ -0,0 +1,462 @@
+{
+  "panels": [
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "mappings": [
+            {
+              "options": {
+                "0": {
+                  "color": "red",
+                  "index": 1,
+                  "text": "Offline"
+                },
+                "1": {
+                  "color": "green",
+                  "index": 0,
+                  "text": "Online"
+                }
+              },
+              "type": "value"
+            }
+          ],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "red",
+                "value": null
+              },
+              {
+                "color": "green",
+                "value": 1
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 0,
+        "y": 0
+      },
+      "id": 1,
+      "options": {
+        "colorMode": "background",
+        "graphMode": "none",
+        "justifyMode": "auto",
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        },
+        "textMode": "auto"
+      },
+      "targets": [
+        {
+          "expr": "mc_status_healthy{host=\"oyasai-minecraft-main\"}",
+          "instant": true,
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "title": "Main Server",
+      "type": "stat"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "mappings": [
+            {
+              "options": {
+                "0": {
+                  "color": "red",
+                  "index": 1,
+                  "text": "Offline"
+                },
+                "1": {
+                  "color": "green",
+                  "index": 0,
+                  "text": "Online"
+                }
+              },
+              "type": "value"
+            }
+          ],
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "red",
+                "value": null
+              },
+              {
+                "color": "green",
+                "value": 1
+              }
+            ]
+          }
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 6,
+        "y": 0
+      },
+      "id": 2,
+      "options": {
+        "colorMode": "background",
+        "graphMode": "none",
+        "justifyMode": "auto",
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        },
+        "textMode": "auto"
+      },
+      "targets": [
+        {
+          "expr": "mc_status_healthy{host=\"oyasai-minecraft-lobby\"}",
+          "instant": true,
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "title": "Lobby Server",
+      "type": "stat"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          },
+          "unit": "none"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 12,
+        "y": 0
+      },
+      "id": 3,
+      "options": {
+        "colorMode": "value",
+        "graphMode": "area",
+        "justifyMode": "auto",
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        },
+        "textMode": "auto"
+      },
+      "targets": [
+        {
+          "expr": "mc_status_players_online{host=\"oyasai-minecraft-main\"}",
+          "instant": true,
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "title": "Main Players Online",
+      "type": "stat"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "thresholds"
+          },
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "blue",
+                "value": null
+              }
+            ]
+          },
+          "unit": "none"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 4,
+        "w": 6,
+        "x": 18,
+        "y": 0
+      },
+      "id": 4,
+      "options": {
+        "colorMode": "value",
+        "graphMode": "area",
+        "justifyMode": "auto",
+        "orientation": "auto",
+        "reduceOptions": {
+          "calcs": ["lastNotNull"],
+          "fields": "",
+          "values": false
+        },
+        "textMode": "auto"
+      },
+      "targets": [
+        {
+          "expr": "mc_status_players_online{host=\"oyasai-minecraft-lobby\"}",
+          "instant": true,
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "title": "Lobby Players Online",
+      "type": "stat"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "smooth",
+            "lineWidth": 2,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            }
+          },
+          "min": 0,
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "none"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 24,
+        "x": 0,
+        "y": 4
+      },
+      "id": 5,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "none"
+        }
+      },
+      "targets": [
+        {
+          "expr": "mc_status_players_online{host=\"oyasai-minecraft-main\"}",
+          "legendFormat": "Main",
+          "refId": "A"
+        },
+        {
+          "expr": "mc_status_players_online{host=\"oyasai-minecraft-lobby\"}",
+          "legendFormat": "Lobby",
+          "refId": "B"
+        }
+      ],
+      "title": "Players Online",
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "prometheus",
+        "uid": "prometheus"
+      },
+      "fieldConfig": {
+        "defaults": {
+          "color": {
+            "mode": "palette-classic"
+          },
+          "custom": {
+            "axisLabel": "",
+            "axisPlacement": "auto",
+            "drawStyle": "line",
+            "fillOpacity": 10,
+            "gradientMode": "none",
+            "hideFrom": {
+              "legend": false,
+              "tooltip": false,
+              "viz": false
+            },
+            "lineInterpolation": "smooth",
+            "lineWidth": 2,
+            "pointSize": 5,
+            "scaleDistribution": {
+              "type": "linear"
+            },
+            "showPoints": "never",
+            "spanNulls": false,
+            "stacking": {
+              "group": "A",
+              "mode": "none"
+            }
+          },
+          "thresholds": {
+            "mode": "absolute",
+            "steps": [
+              {
+                "color": "green",
+                "value": null
+              }
+            ]
+          },
+          "unit": "s"
+        },
+        "overrides": []
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 0,
+        "y": 12
+      },
+      "id": 6,
+      "options": {
+        "legend": {
+          "calcs": [],
+          "displayMode": "list",
+          "placement": "bottom"
+        },
+        "tooltip": {
+          "mode": "multi",
+          "sort": "none"
+        }
+      },
+      "targets": [
+        {
+          "expr": "mc_status_response_time_seconds{host=\"oyasai-minecraft-main\"}",
+          "legendFormat": "Main",
+          "refId": "A"
+        },
+        {
+          "expr": "mc_status_response_time_seconds{host=\"oyasai-minecraft-lobby\"}",
+          "legendFormat": "Lobby",
+          "refId": "B"
+        }
+      ],
+      "title": "Server Response Time",
+      "type": "timeseries"
+    },
+    {
+      "datasource": {
+        "type": "loki",
+        "uid": "loki"
+      },
+      "gridPos": {
+        "h": 8,
+        "w": 12,
+        "x": 12,
+        "y": 12
+      },
+      "id": 7,
+      "options": {
+        "dedupStrategy": "none",
+        "enableLogDetails": true,
+        "prettifyLogMessage": false,
+        "showCommonLabels": false,
+        "showLabels": false,
+        "showTime": true,
+        "sortOrder": "Descending",
+        "wrapLogMessage": false
+      },
+      "targets": [
+        {
+          "expr": "{container=~\"oyasai-minecraft.*\"}",
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "title": "Minecraft Logs",
+      "type": "logs"
+    }
+  ],
+  "refresh": "30s",
+  "schemaVersion": 39,
+  "tags": ["minecraft"],
+  "time": {
+    "from": "now-1h",
+    "to": "now"
+  },
+  "timezone": "browser",
+  "title": "Oyasai Minecraft",
+  "uid": "oyasai-minecraft",
+  "version": 1
+}
diff --git a/packages/oyasai-grafana/package.nix b/packages/oyasai-grafana/package.nix
new file mode 100644
index 000000000..4d0319bc1
--- /dev/null
+++ b/packages/oyasai-grafana/package.nix
@@ -0,0 +1,91 @@
+{
+  lib,
+  grafana,
+  oyasaiDockerTools,
+  stdenv,
+  formats,
+  runCommandLocal,
+}:
+
+let
+  datasourceYml = (formats.yaml { }).generate "prometheus.yaml" {
+    apiVersion = 1;
+    datasources = [
+      {
+        name = "Prometheus";
+        uid = "prometheus";
+        type = "prometheus";
+        url = "http://prometheus:9090";
+        isDefault = true;
+        access = "proxy";
+      }
+    ];
+  };
+
+  lokiYml = (formats.yaml { }).generate "loki.yaml" {
+    apiVersion = 1;
+    datasources = [
+      {
+        name = "Loki";
+        uid = "loki";
+        type = "loki";
+        url = "http://loki:3100";
+        access = "proxy";
+      }
+    ];
+  };
+
+  dashboardsDir = runCommandLocal "grafana-dashboards" { } ''
+    mkdir -p $out
+    cp ${./oyasai-grafana-dashboard.json} $out/minecraft.json
+  '';
+
+  dashboardsProvisionerYml = (formats.yaml { }).generate "dashboards.yaml" {
+    apiVersion = 1;
+    providers = [
+      {
+        name = "oyasai";
+        type = "file";
+        disableDeletion = true;
+        allowUiUpdates = false;
+        options.path = "${dashboardsDir}";
+      }
+    ];
+  };
+
+  # Bake data sources and dashboards into the image via provisioning directory.
+  # Grafana reads this on startup and auto-configures them.
+  provisioningDir = runCommandLocal "grafana-provisioning" { } ''
+    mkdir -p $out/datasources $out/dashboards
+    cp ${datasourceYml} $out/datasources/prometheus.yaml
+    cp ${lokiYml} $out/datasources/loki.yaml
+    cp ${dashboardsProvisionerYml} $out/dashboards/oyasai.yaml
+  '';
+in
+lib.optionalAttrs stdenv.hostPlatform.isLinux {
+  docker = oyasaiDockerTools.buildLayeredImage {
+    name = "oyasai-grafana";
+    config = {
+      Cmd = [
+        "${grafana}/bin/grafana"
+        "server"
+        "--homepath=${grafana}/share/grafana"
+      ];
+      Env = [
+        "GF_PATHS_HOME=${grafana}/share/grafana"
+        "GF_PATHS_PROVISIONING=${provisioningDir}"
+        "GF_PATHS_DATA=/data"
+        "GF_PATHS_LOGS=/data/log"
+        "GF_PATHS_PLUGINS=/data/plugins"
+        "GF_SERVER_HTTP_PORT=3000"
+        "GF_AUTH_ANONYMOUS_ENABLED=true"
+        "GF_AUTH_ANONYMOUS_ORG_ROLE=Admin"
+        "GF_AUTH_DISABLE_LOGIN_FORM=true"
+        "GF_USERS_ALLOW_SIGN_UP=false"
+      ];
+      ExposedPorts = {
+        "3000/tcp" = { };
+      };
+    };
+  };
+}
diff --git a/packages/oyasai-loki.nix b/packages/oyasai-loki.nix
new file mode 100644
index 000000000..b545b952d
--- /dev/null
+++ b/packages/oyasai-loki.nix
@@ -0,0 +1,53 @@
+{
+  lib,
+  grafana-loki,
+  oyasaiDockerTools,
+  stdenv,
+  formats,
+}:
+
+let
+  lokiYml = (formats.yaml { }).generate "loki.yml" {
+    auth_enabled = false;
+
+    server.http_listen_port = 3100;
+
+    common = {
+      instance_addr = "127.0.0.1";
+      path_prefix = "/data";
+      storage.filesystem = {
+        chunks_directory = "/data/chunks";
+        rules_directory = "/data/rules";
+      };
+      replication_factor = 1;
+      ring.kvstore.store = "inmemory";
+    };
+
+    schema_config.configs = [
+      {
+        from = "2020-10-24";
+        store = "tsdb";
+        object_store = "filesystem";
+        schema = "v13";
+        index = {
+          prefix = "index_";
+          period = "24h";
+        };
+      }
+    ];
+  };
+in
+lib.optionalAttrs stdenv.hostPlatform.isLinux {
+  docker = oyasaiDockerTools.buildLayeredImage {
+    name = "oyasai-loki";
+    config = {
+      Cmd = [
+        "${grafana-loki}/bin/loki"
+        "-config.file=${lokiYml}"
+      ];
+      ExposedPorts = {
+        "3100/tcp" = { };
+      };
+    };
+  };
+}
diff --git a/packages/oyasai-mc-monitor-exporter.nix b/packages/oyasai-mc-monitor-exporter.nix
new file mode 100644
index 000000000..585dfbb8c
--- /dev/null
+++ b/packages/oyasai-mc-monitor-exporter.nix
@@ -0,0 +1,29 @@
+{
+  lib,
+  mc-monitor,
+  oyasaiDockerTools,
+  stdenv,
+  writeShellApplication,
+}:
+
+let
+  result = writeShellApplication {
+    name = "oyasai-mc-monitor-exporter";
+    runtimeInputs = [ mc-monitor ];
+    text = ''
+      exec mc-monitor export-for-prometheus "$@"
+    '';
+    passthru = lib.optionalAttrs stdenv.hostPlatform.isLinux {
+      docker = oyasaiDockerTools.buildLayeredImage {
+        name = "oyasai-mc-monitor-exporter";
+        config = {
+          Cmd = [ (lib.getExe result) ];
+          ExposedPorts = {
+            "8080/tcp" = { };
+          };
+        };
+      };
+    };
+  };
+in
+result
diff --git a/packages/oyasai-prometheus.nix b/packages/oyasai-prometheus.nix
new file mode 100644
index 000000000..c3fe8382c
--- /dev/null
+++ b/packages/oyasai-prometheus.nix
@@ -0,0 +1,39 @@
+{
+  lib,
+  prometheus,
+  oyasaiDockerTools,
+  stdenv,
+  formats,
+}:
+
+let
+  prometheusYml = (formats.yaml { }).generate "prometheus.yml" {
+    global = {
+      scrape_interval = "15s";
+      evaluation_interval = "15s";
+    };
+    scrape_configs = [
+      {
+        job_name = "minecraft";
+        static_configs = [ { targets = [ "mc-monitor-exporter:8080" ]; } ];
+      }
+    ];
+  };
+in
+lib.optionalAttrs stdenv.hostPlatform.isLinux {
+  docker = oyasaiDockerTools.buildLayeredImage {
+    name = "oyasai-prometheus";
+    config = {
+      Cmd = [
+        "${prometheus}/bin/prometheus"
+        "--config.file=${prometheusYml}"
+        "--storage.tsdb.path=/data"
+        "--web.console.libraries=${prometheus}/share/prometheus/console_libraries"
+        "--web.console.templates=${prometheus}/share/prometheus/consoles"
+      ];
+      ExposedPorts = {
+        "9090/tcp" = { };
+      };
+    };
+  };
+}