diff --git a/examples/grafana/dashboard.json b/examples/grafana/dashboard.json
new file mode 100644
index 0000000..9af6a16
--- /dev/null
+++ b/examples/grafana/dashboard.json
@@ -0,0 +1,902 @@
+{
+    "annotations": {
+        "list": [
+            {
+                "name": "429 Rate Limits",
+                "datasource": {
+                    "type": "loki",
+                    "uid": "loki"
+                },
+                "enable": true,
+                "iconColor": "red",
+                "expr": "{service_name=\"anthropic-proxy\"} |= \"upstream error\" | json | status = \"429\"",
+                "titleFormat": "429 Rate Limited",
+                "textFormat": "{{error_message}}"
+            }
+        ]
+    },
+    "editable": true,
+    "graphTooltip": 1,
+    "links": [],
+    "templating": {
+        "list": [
+            {
+                "name": "window_age_5h",
+                "type": "query",
+                "datasource": {
+                    "type": "prometheus",
+                    "uid": "prometheus"
+                },
+                "query": "query_result(time() - proxy_usage_resets_at{window=\"5h\"} + 18000)",
+                "regex": "/.* (\\d+\\.?\\d*) .*/",
+                "refresh": 2,
+                "hide": 2
+            },
+            {
+                "name": "window_age_7d",
+                "type": "query",
+                "datasource": {
+                    "type": "prometheus",
+                    "uid": "prometheus"
+                },
+                "query": "query_result(time() - proxy_usage_resets_at{window=\"7d\"} + 604800)",
+                "regex": "/.* (\\d+\\.?\\d*) .*/",
+                "refresh": 2,
+                "hide": 2
+            }
+        ]
+    },
+    "panels": [
+        {
+            "title": "5h Utilization",
+            "type": "gauge",
+            "gridPos": {
+                "h": 6,
+                "w": 6,
+                "x": 0,
+                "y": 0
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "unit": "percent",
+                    "min": 0,
+                    "max": 100,
+                    "thresholds": {
+                        "steps": [
+                            {
+                                "color": "green",
+                                "value": null
+                            },
+                            {
+                                "color": "yellow",
+                                "value": 60
+                            },
+                            {
+                                "color": "orange",
+                                "value": 80
+                            },
+                            {
+                                "color": "red",
+                                "value": 95
+                            }
+                        ]
+                    }
+                },
+                "overrides": []
+            },
+            "options": {
+                "reduceOptions": {
+                    "calcs": [
+                        "lastNotNull"
+                    ]
+                },
+                "showThresholdLabels": false
+            },
+            "targets": [
+                {
+                    "expr": "proxy_usage_utilization{window=\"5h\"}",
+                    "legendFormat": "5h",
+                    "refId": "A"
+                }
+            ]
+        },
+        {
+            "title": "7d Utilization",
+            "type": "gauge",
+            "gridPos": {
+                "h": 6,
+                "w": 6,
+                "x": 6,
+                "y": 0
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "unit": "percent",
+                    "min": 0,
+                    "max": 100,
+                    "thresholds": {
+                        "steps": [
+                            {
+                                "color": "green",
+                                "value": null
+                            },
+                            {
+                                "color": "yellow",
+                                "value": 60
+                            },
+                            {
+                                "color": "orange",
+                                "value": 80
+                            },
+                            {
+                                "color": "red",
+                                "value": 95
+                            }
+                        ]
+                    }
+                },
+                "overrides": []
+            },
+            "options": {
+                "reduceOptions": {
+                    "calcs": [
+                        "lastNotNull"
+                    ]
+                },
+                "showThresholdLabels": false
+            },
+            "targets": [
+                {
+                    "expr": "proxy_usage_utilization{window=\"7d\"}",
+                    "legendFormat": "7d",
+                    "refId": "A"
+                }
+            ]
+        },
+        {
+            "title": "Window Tokens In",
+            "description": "Input tokens in current Anthropic rate limit windows. Resets when window rolls over.",
+            "type": "stat",
+            "gridPos": {
+                "h": 6,
+                "w": 6,
+                "x": 12,
+                "y": 0
+            },
+            "datasource": {
+                "type": "loki",
+                "uid": "loki"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "unit": "short",
+                    "color": {
+                        "mode": "fixed",
+                        "fixedColor": "blue"
+                    }
+                },
+                "overrides": []
+            },
+            "options": {
+                "reduceOptions": {
+                    "calcs": [
+                        "lastNotNull"
+                    ]
+                },
+                "colorMode": "background",
+                "graphMode": "area",
+                "textMode": "auto"
+            },
+            "targets": [
+                {
+                    "datasource": {
+                        "type": "loki",
+                        "uid": "loki"
+                    },
+                    "expr": "sum(sum_over_time({service_name=\"anthropic-proxy\"} |= \"completed\" | unwrap input_tokens | __error__=\"\" [${window_age_5h}s]))",
+                    "legendFormat": "5h window",
+                    "refId": "A"
+                },
+                {
+                    "datasource": {
+                        "type": "loki",
+                        "uid": "loki"
+                    },
+                    "expr": "sum(sum_over_time({service_name=\"anthropic-proxy\"} |= \"completed\" | unwrap input_tokens | __error__=\"\" [${window_age_7d}s]))",
+                    "legendFormat": "7d window",
+                    "refId": "B"
+                }
+            ]
+        },
+        {
+            "title": "Window Tokens Out",
+            "description": "Output tokens in current Anthropic rate limit windows. Resets when window rolls over.",
+            "type": "stat",
+            "gridPos": {
+                "h": 6,
+                "w": 6,
+                "x": 18,
+                "y": 0
+            },
+            "datasource": {
+                "type": "loki",
+                "uid": "loki"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "unit": "short",
+                    "color": {
+                        "mode": "fixed",
+                        "fixedColor": "green"
+                    }
+                },
+                "overrides": []
+            },
+            "options": {
+                "reduceOptions": {
+                    "calcs": [
+                        "lastNotNull"
+                    ]
+                },
+                "colorMode": "background",
+                "graphMode": "area",
+                "textMode": "auto"
+            },
+            "targets": [
+                {
+                    "datasource": {
+                        "type": "loki",
+                        "uid": "loki"
+                    },
+                    "expr": "sum(sum_over_time({service_name=\"anthropic-proxy\"} |= \"completed\" | unwrap output_tokens | __error__=\"\" [${window_age_5h}s]))",
+                    "legendFormat": "5h window",
+                    "refId": "A"
+                },
+                {
+                    "datasource": {
+                        "type": "loki",
+                        "uid": "loki"
+                    },
+                    "expr": "sum(sum_over_time({service_name=\"anthropic-proxy\"} |= \"completed\" | unwrap output_tokens | __error__=\"\" [${window_age_7d}s]))",
+                    "legendFormat": "7d window",
+                    "refId": "B"
+                }
+            ]
+        },
+        {
+            "title": "Utilization Over Time",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 24,
+                "x": 0,
+                "y": 6
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 15,
+                        "lineWidth": 2,
+                        "thresholdsStyle": {
+                            "mode": "line"
+                        }
+                    },
+                    "unit": "percent",
+                    "min": 0,
+                    "max": 100,
+                    "thresholds": {
+                        "mode": "absolute",
+                        "steps": [
+                            {
+                                "color": "green",
+                                "value": null
+                            },
+                            {
+                                "color": "yellow",
+                                "value": 60
+                            },
+                            {
+                                "color": "orange",
+                                "value": 80
+                            },
+                            {
+                                "color": "red",
+                                "value": 95
+                            }
+                        ]
+                    }
+                },
+                "overrides": []
+            },
+            "targets": [
+                {
+                    "expr": "proxy_usage_utilization{window=\"5h\"}",
+                    "legendFormat": "5h utilization",
+                    "refId": "A"
+                },
+                {
+                    "expr": "proxy_usage_utilization{window=\"7d\"}",
+                    "legendFormat": "7d utilization",
+                    "refId": "B"
+                }
+            ]
+        },
+        {
+            "type": "timeseries",
+            "title": "5h Window Tokens",
+            "datasource": {
+                "type": "loki",
+                "uid": "loki"
+            },
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 0,
+                "y": 14
+            },
+            "id": 100,
+            "targets": [
+                {
+                    "datasource": {
+                        "type": "loki",
+                        "uid": "loki"
+                    },
+                    "expr": "sum(sum_over_time({service_name=\"anthropic-proxy\"} |= \"completed\" | unwrap output_tokens | __error__=\"\" [$__interval]))",
+                    "legendFormat": "output",
+                    "refId": "A"
+                }
+            ],
+            "timeFrom": "${window_age_5h}s",
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 20,
+                        "lineWidth": 2,
+                        "stacking": {
+                            "mode": "none"
+                        },
+                        "pointSize": 1,
+                        "spanNulls": true
+                    },
+                    "unit": "short"
+                },
+                "overrides": [
+                    {
+                        "matcher": {
+                            "id": "byName",
+                            "options": "input"
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "blue",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    },
+                    {
+                        "matcher": {
+                            "id": "byName",
+                            "options": "output"
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "green",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    }
+                ]
+            },
+            "transformations": [
+                {
+                    "id": "calculateField",
+                    "options": {
+                        "mode": "cumulativeFunctions",
+                        "cumulative": {
+                            "field": "Value",
+                            "reducer": "sum"
+                        },
+                        "alias": "output total",
+                        "replaceFields": true
+                    }
+                }
+            ],
+            "options": {
+                "tooltip": {
+                    "mode": "multi"
+                }
+            },
+            "hideTimeOverride": true
+        },
+        {
+            "type": "timeseries",
+            "title": "7d Window Tokens",
+            "datasource": {
+                "type": "loki",
+                "uid": "loki"
+            },
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 12,
+                "y": 14
+            },
+            "id": 101,
+            "targets": [
+                {
+                    "datasource": {
+                        "type": "loki",
+                        "uid": "loki"
+                    },
+                    "expr": "sum(sum_over_time({service_name=\"anthropic-proxy\"} |= \"completed\" | unwrap output_tokens | __error__=\"\" [$__interval]))",
+                    "legendFormat": "output",
+                    "refId": "A"
+                }
+            ],
+            "timeFrom": "${window_age_7d}s",
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 20,
+                        "lineWidth": 2,
+                        "stacking": {
+                            "mode": "none"
+                        },
+                        "pointSize": 1,
+                        "spanNulls": true
+                    },
+                    "unit": "short"
+                },
+                "overrides": [
+                    {
+                        "matcher": {
+                            "id": "byName",
+                            "options": "input"
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "blue",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    },
+                    {
+                        "matcher": {
+                            "id": "byName",
+                            "options": "output"
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "yellow",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    }
+                ]
+            },
+            "transformations": [
+                {
+                    "id": "calculateField",
+                    "options": {
+                        "mode": "cumulativeFunctions",
+                        "cumulative": {
+                            "field": "Value",
+                            "reducer": "sum"
+                        },
+                        "alias": "output total",
+                        "replaceFields": true
+                    }
+                }
+            ],
+            "options": {
+                "tooltip": {
+                    "mode": "multi"
+                }
+            },
+            "hideTimeOverride": true
+        },
+        {
+            "title": "Request Rate",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 12,
+                "y": 14
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 15,
+                        "lineWidth": 2
+                    },
+                    "unit": "reqps"
+                },
+                "overrides": []
+            },
+            "targets": [
+                {
+                    "expr": "sum(rate(proxy_request_count_total[5m])) by (stream)",
+                    "legendFormat": "stream={{stream}}",
+                    "refId": "A"
+                },
+                {
+                    "expr": "sum(rate(proxy_request_count_total[5m]))",
+                    "legendFormat": "total",
+                    "refId": "B"
+                }
+            ]
+        },
+        {
+            "title": "Error Rate",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 0,
+                "y": 22
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 15,
+                        "lineWidth": 2
+                    },
+                    "unit": "reqps"
+                },
+                "overrides": []
+            },
+            "targets": [
+                {
+                    "expr": "sum(rate(proxy_upstream_errors_total[5m])) by (error_type)",
+                    "legendFormat": "{{error_type}}",
+                    "refId": "A"
+                },
+                {
+                    "expr": "sum(rate(proxy_request_count_total{status_code=~\"4..|5..\"}[5m])) by (status_code)",
+                    "legendFormat": "HTTP {{status_code}}",
+                    "refId": "B"
+                }
+            ]
+        },
+        {
+            "title": "Request Latency (p50/p95/p99)",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 0,
+                "y": 30
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 10,
+                        "lineWidth": 2
+                    },
+                    "unit": "ms"
+                },
+                "overrides": []
+            },
+            "targets": [
+                {
+                    "expr": "histogram_quantile(0.50, sum(rate(proxy_request_duration_ms_milliseconds_bucket[5m])) by (le))",
+                    "legendFormat": "p50",
+                    "refId": "A"
+                },
+                {
+                    "expr": "histogram_quantile(0.95, sum(rate(proxy_request_duration_ms_milliseconds_bucket[5m])) by (le))",
+                    "legendFormat": "p95",
+                    "refId": "B"
+                },
+                {
+                    "expr": "histogram_quantile(0.99, sum(rate(proxy_request_duration_ms_milliseconds_bucket[5m])) by (le))",
+                    "legendFormat": "p99",
+                    "refId": "C"
+                }
+            ]
+        },
+        {
+            "title": "Requests by Status Code",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 12,
+                "y": 30
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "bars",
+                        "fillOpacity": 50,
+                        "lineWidth": 1,
+                        "stacking": {
+                            "mode": "normal"
+                        }
+                    },
+                    "unit": "short"
+                },
+                "overrides": [
+                    {
+                        "matcher": {
+                            "id": "byRegexp",
+                            "options": "2.."
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "green",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    },
+                    {
+                        "matcher": {
+                            "id": "byRegexp",
+                            "options": "4.."
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "yellow",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    },
+                    {
+                        "matcher": {
+                            "id": "byRegexp",
+                            "options": "5.."
+                        },
+                        "properties": [
+                            {
+                                "id": "color",
+                                "value": {
+                                    "fixedColor": "red",
+                                    "mode": "fixed"
+                                }
+                            }
+                        ]
+                    }
+                ]
+            },
+            "targets": [
+                {
+                    "expr": "sum(rate(proxy_request_count_total[5m])) by (status_code) * 60",
+                    "legendFormat": "{{status_code}}",
+                    "refId": "A"
+                }
+            ]
+        },
+        {
+            "title": "Total Requests",
+            "type": "stat",
+            "gridPos": {
+                "h": 4,
+                "w": 6,
+                "x": 0,
+                "y": 43
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "unit": "short"
+                },
+                "overrides": []
+            },
+            "options": {
+                "reduceOptions": {
+                    "calcs": [
+                        "lastNotNull"
+                    ]
+                },
+                "colorMode": "background",
+                "graphMode": "area"
+            },
+            "targets": [
+                {
+                    "expr": "sum(proxy_request_count_total)",
+                    "legendFormat": "requests",
+                    "refId": "A"
+                }
+            ]
+        },
+        {
+            "title": "Credential Cooldowns",
+            "type": "stat",
+            "gridPos": {
+                "h": 4,
+                "w": 6,
+                "x": 6,
+                "y": 43
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "unit": "short",
+                    "thresholds": {
+                        "steps": [
+                            {
+                                "color": "green",
+                                "value": null
+                            },
+                            {
+                                "color": "yellow",
+                                "value": 1
+                            },
+                            {
+                                "color": "red",
+                                "value": 5
+                            }
+                        ]
+                    }
+                },
+                "overrides": []
+            },
+            "options": {
+                "reduceOptions": {
+                    "calcs": [
+                        "lastNotNull"
+                    ]
+                },
+                "colorMode": "background",
+                "graphMode": "none"
+            },
+            "targets": [
+                {
+                    "expr": "sum(proxy_credential_cooldowns_total) or vector(0)",
+                    "legendFormat": "cooldowns",
+                    "refId": "A"
+                }
+            ]
+        },
+        {
+            "title": "Tokens by Model",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 0,
+                "y": 47
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "bars",
+                        "fillOpacity": 50,
+                        "lineWidth": 1,
+                        "stacking": {
+                            "mode": "normal"
+                        }
+                    },
+                    "unit": "short"
+                },
+                "overrides": []
+            },
+            "targets": [
+                {
+                    "expr": "sum(rate(proxy_tokens_input_total[5m])) by (model) * 60",
+                    "legendFormat": "in: {{model}}",
+                    "refId": "A"
+                },
+                {
+                    "expr": "sum(rate(proxy_tokens_output_total[5m])) by (model) * 60",
+                    "legendFormat": "out: {{model}}",
+                    "refId": "B"
+                }
+            ]
+        },
+        {
+            "title": "Request Body Size (p50/p95)",
+            "type": "timeseries",
+            "gridPos": {
+                "h": 8,
+                "w": 12,
+                "x": 12,
+                "y": 47
+            },
+            "datasource": {
+                "type": "prometheus",
+                "uid": "prometheus"
+            },
+            "fieldConfig": {
+                "defaults": {
+                    "custom": {
+                        "drawStyle": "line",
+                        "fillOpacity": 10,
+                        "lineWidth": 2
+                    },
+                    "unit": "decbytes"
+                },
+                "overrides": []
+            },
+            "targets": [
+                {
+                    "expr": "histogram_quantile(0.50, sum(rate(proxy_request_body_size_bytes_bucket[5m])) by (le))",
+                    "legendFormat": "p50",
+                    "refId": "A"
+                },
+                {
+                    "expr": "histogram_quantile(0.95, sum(rate(proxy_request_body_size_bytes_bucket[5m])) by (le))",
+                    "legendFormat": "p95",
+                    "refId": "B"
+                }
+            ]
+        }
+    ],
+    "refresh": "30s",
+    "schemaVersion": 39,
+    "tags": [
+        "anthropic-proxy",
+        "otel"
+    ],
+    "time": {
+        "from": "now-6h",
+        "to": "now"
+    },
+    "timepicker": {},
+    "timezone": "browser",
+    "title": "Anthropic Proxy",
+    "uid": "anthropic-proxy"
+}