{
  "schemaVersion": 39,
  "title": "Signals Pipeline",
  "panels": [
    {
      "type": "stat",
      "title": "Scoring p95 (s)",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "s", "decimals": 2}},
      "targets": [
        {"expr": "histogram_quantile(0.95, sum(rate(signals_reachability_scoring_duration_seconds_bucket[5m])) by (le))"}
      ]
    },
    {
      "type": "timeseries",
      "title": "Scoring Duration p95/p50",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "s", "decimals": 2}},
      "targets": [
        {"expr": "histogram_quantile(0.95, sum(rate(signals_reachability_scoring_duration_seconds_bucket[5m])) by (le))", "legendFormat": "p95"},
        {"expr": "histogram_quantile(0.50, sum(rate(signals_reachability_scoring_duration_seconds_bucket[5m])) by (le))", "legendFormat": "p50"}
      ]
    },
    {
      "type": "gauge",
      "title": "Cache Hit Ratio (5m)",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "percent", "min": 0, "max": 100}},
      "options": {"reduceOptions": {"calcs": ["last"]}, "orientation": "horizontal"},
      "targets": [
        {"expr": "100 * clamp_min(rate(signals_cache_hits_total[5m]),0) / clamp_min(rate(signals_cache_hits_total[5m]) + rate(signals_cache_misses_total[5m]), 1)"}
      ]
    },
    {
      "type": "timeseries",
      "title": "Cache Hits/Misses",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "1/s"}},
      "targets": [
        {"expr": "rate(signals_cache_hits_total[5m])", "legendFormat": "hits"},
        {"expr": "rate(signals_cache_misses_total[5m])", "legendFormat": "misses"}
      ]
    },
    {
      "type": "stat",
      "title": "Sensors Reporting",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "none"}},
      "targets": [
        {"expr": "count(max_over_time(signals_sensor_last_seen_timestamp_seconds[15m]))"}
      ]
    },
    {
      "type": "timeseries",
      "title": "Sensor Staleness",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "s"}},
      "targets": [
        {"expr": "time() - max(signals_sensor_last_seen_timestamp_seconds) by (sensor)", "legendFormat": "{{sensor}}"}
      ]
    },
    {
      "type": "barchart",
      "title": "Ingestion Outcomes",
      "datasource": "Prometheus",
      "fieldConfig": {"defaults": {"unit": "1/s"}},
      "options": {"displayMode": "series"},
      "targets": [
        {"expr": "rate(signals_ingestion_total[5m])", "legendFormat": "total"},
        {"expr": "rate(signals_ingestion_failures_total[5m])", "legendFormat": "failures"}
      ]
    }
  ]
}