feat(incidents): add absolute start dates, severity splitting, and alert gap detection

Decouple the fetch window (always 15 days) from the display window (user-selected N days)
so that firstTimestamp reflects the true incident/alert start time regardless of the
currently visible time range. Split incidents when severity changes between consecutive
timestamps and split alerts when gaps exceed the 300s Prometheus scrape interval.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rioloc

web/src/components/Incidents/AlertsChart/AlertsChart.tsx

@@ -73,7 +73,18 @@ const AlertsChart = ({ theme }: { theme: 'light' | 'dark' }) => {
 
   const chartData: AlertsChartBar[][] = useMemo(() => {
     if (!Array.isArray(alertsData) || alertsData.length === 0) return [];
-    return alertsData.map((alert) => createAlertsChartBars(alert));
+
+    // Group alerts by identity so intervals of the same alert share the same row
+    const groupedByIdentity = new Map<string, typeof alertsData>();
+    for (const alert of alertsData) {
+      const key = [alert.alertname, alert.namespace, alert.severity].join('|');
+      if (!groupedByIdentity.has(key)) {
+        groupedByIdentity.set(key, []);
+      }
+      groupedByIdentity.get(key)!.push(alert);
+    }
+
+    return Array.from(groupedByIdentity.values()).map((alerts) => createAlertsChartBars(alerts));
   }, [alertsData]);
 
   useEffect(() => {
@@ -161,7 +172,7 @@ const AlertsChart = ({ theme }: { theme: 'light' | 'dark' }) => {
                     if (datum.nodata) {
                       return '';
                     }
-                    const startDate = dateTimeFormatter(i18n.language).format(new Date(datum.y0));
+                    const startDate = dateTimeFormatter(i18n.language).format(datum.startDate);
                     const endDate =
                       datum.alertstate === 'firing'
                         ? '---'

web/src/components/Incidents/IncidentsChart/IncidentsChart.tsx

@@ -33,6 +33,7 @@ import {
   calculateIncidentsChartDomain,
   createIncidentsChartBars,
   generateDateArray,
+  removeTrailingPaddingFromSeveritySegments,
   roundDateToInterval,
 } from '../utils';
 import { dateTimeFormatter, timeFormatter } from '../../console/utils/datetime';
@@ -89,10 +90,29 @@ const IncidentsChart = ({
       ? incidentsData.filter((incident) => incident.group_id === selectedGroupId)
       : incidentsData;
 
-    // Create chart bars and sort by original x values to maintain proper order
-    const chartBars = filteredIncidents.map((incident) =>
-      createIncidentsChartBars(incident, dateValues),
+    // Group incidents by group_id so split severity segments share the same row
+    const incidentsByGroupId = new Map<string, typeof filteredIncidents>();
+    for (const incident of filteredIncidents) {
+      const existing = incidentsByGroupId.get(incident.group_id);
+      if (existing) {
+        existing.push(incident);
+      } else {
+        incidentsByGroupId.set(incident.group_id, [incident]);
+      }
+    }
+
+    // When an incident changes severity, its segments share the same row.
+    // Non-last segments have trailing padding (+300s) that overlaps with the
+    // next segment's leading padding (-300s). Remove the trailing padding
+    // value from non-last segments to prevent visual overlap.
+    const adjustedGroups = Array.from(incidentsByGroupId.values()).map((group) =>
+      removeTrailingPaddingFromSeveritySegments(group),
     );
+
+    // Create chart bars per group and sort by original x values
+    const chartBars = adjustedGroups
+      .map((group) => createIncidentsChartBars(group, dateValues))
+      .filter((bars) => bars.length > 0);
     chartBars.sort((a, b) => a[0].x - b[0].x);
 
     // Reassign consecutive x values to eliminate gaps between bars
@@ -102,7 +122,6 @@ const IncidentsChart = ({
   useEffect(() => {
     setIsLoading(false);
   }, [incidentsData]);
-
   useEffect(() => {
     setChartContainerHeight(chartData?.length < 5 ? 300 : chartData?.length * 60);
     setChartHeight(chartData?.length < 5 ? 250 : chartData?.length * 55);
@@ -176,7 +195,7 @@ const IncidentsChart = ({
                     if (datum.nodata) {
                       return '';
                     }
-                    const startDate = dateTimeFormatter(i18n.language).format(new Date(datum.y0));
+                    const startDate = dateTimeFormatter(i18n.language).format(datum.startDate);
                     const endDate = datum.firing
                       ? '---'
                       : dateTimeFormatter(i18n.language).format(

web/src/components/Incidents/IncidentsDetailsRowTable.tsx

@@ -24,10 +24,11 @@ const IncidentsDetailsRowTable = ({ alerts }: IncidentsDetailsRowTableProps) =>
   const sortedAndMappedAlerts = useMemo(() => {
     if (alerts && alerts.length > 0) {
       return [...alerts]
-        .sort(
-          (a: IncidentsDetailsAlert, b: IncidentsDetailsAlert) =>
-            a.alertsStartFiring - b.alertsStartFiring,
-        )
+        .sort((a: IncidentsDetailsAlert, b: IncidentsDetailsAlert) => {
+          const aStart = a.firstTimestamp > 0 ? a.firstTimestamp : a.alertsStartFiring;
+          const bStart = b.firstTimestamp > 0 ? b.firstTimestamp : b.alertsStartFiring;
+          return aStart - bStart;
+        })
         .map((alertDetails: IncidentsDetailsAlert, rowIndex) => {
           return (
             <Tr key={rowIndex}>
@@ -45,13 +46,21 @@ const IncidentsDetailsRowTable = ({ alerts }: IncidentsDetailsRowTableProps) =>
                 <SeverityBadge severity={alertDetails.severity} />
               </Td>
               <Td dataLabel="expanded-details-firingstart">
-                <Timestamp timestamp={String(alertDetails.alertsStartFiring * 1000)} />
+                <Timestamp
+                  timestamp={new Date(
+                    (alertDetails.firstTimestamp > 0
+                      ? alertDetails.firstTimestamp
+                      : alertDetails.alertsStartFiring) * 1000,
+                  ).toISOString()}
+                />
               </Td>
               <Td dataLabel="expanded-details-firingend">
                 {!alertDetails.resolved ? (
                   '---'
                 ) : (
-                  <Timestamp timestamp={String(alertDetails.alertsEndFiring * 1000)} />
+                  <Timestamp
+                    timestamp={new Date(alertDetails.alertsEndFiring * 1000).toISOString()}
+                  />
                 )}
               </Td>
               <Td dataLabel="expanded-details-alertstate">

web/src/components/Incidents/IncidentsPage.tsx

@@ -39,6 +39,7 @@ import {
   onIncidentFiltersSelect,
   parseUrlParams,
   updateBrowserUrl,
+  DAY_MS,
 } from './utils';
 import { groupAlertsForTable, convertToAlerts } from './processAlerts';
 import { CompressArrowsAltIcon, CompressIcon, FilterIcon } from '@patternfly/react-icons';
@@ -231,52 +232,54 @@ const IncidentsPage = () => {
   }, [incidentsActiveFilters.days]);
 
   useEffect(() => {
-    (async () => {
-      const currentTime = incidentsLastRefreshTime;
-      Promise.all(
-        timeRanges.map(async (range) => {
-          const response = await fetchDataForIncidentsAndAlerts(
-            safeFetch,
-            range,
-            createAlertsQuery(incidentForAlertProcessing),
-          );
-          return response.data.result;
-        }),
-      )
-        .then((results) => {
-          const prometheusResults = results.flat();
-          const alerts = convertToAlerts(
-            prometheusResults,
-            incidentForAlertProcessing,
-            currentTime,
-          );
+    if (incidentForAlertProcessing.length === 0) {
+      return;
+    }
+
+    const currentTime = incidentsLastRefreshTime;
+
+    // Always fetch 15 days of alert data so firstTimestamp is computed from full history
+    const fetchTimeRanges = getIncidentsTimeRanges(15 * DAY_MS, currentTime);
+
+    Promise.all(
+      fetchTimeRanges.map(async (range) => {
+        const response = await fetchDataForIncidentsAndAlerts(
+          safeFetch,
+          range,
+          createAlertsQuery(incidentForAlertProcessing),
+        );
+        return response.data.result;
+      }),
+    )
+      .then((alertsResults) => {
+        const prometheusResults = alertsResults.flat();
+        const alerts = convertToAlerts(
+          prometheusResults,
+          incidentForAlertProcessing,
+          currentTime,
+          daysSpan,
+        );
+        dispatch(
+          setAlertsData({
+            alertsData: alerts,
+          }),
+        );
+        if (rules && alerts) {
           dispatch(
-            setAlertsData({
-              alertsData: alerts,
+            setAlertsTableData({
+              alertsTableData: groupAlertsForTable(alerts, rules),
             }),
           );
-          if (rules && alerts) {
-            dispatch(
-              setAlertsTableData({
-                alertsTableData: groupAlertsForTable(alerts, rules),
-              }),
-            );
-          }
-          if (!isEmpty(filteredData)) {
-            dispatch(setAlertsAreLoading({ alertsAreLoading: false }));
-          } else {
-            dispatch(setAlertsAreLoading({ alertsAreLoading: true }));
-          }
-        })
-        .catch((err) => {
-          // eslint-disable-next-line no-console
-          console.log(err);
-
-          dispatch(setAlertsAreLoading({ alertsAreLoading: false }));
-          setLoadError(err);
-        });
-    })();
-  }, [incidentForAlertProcessing]);
+        }
+        dispatch(setAlertsAreLoading({ alertsAreLoading: false }));
+      })
+      .catch((err) => {
+        // eslint-disable-next-line no-console
+        console.error(err);
+        dispatch(setAlertsAreLoading({ alertsAreLoading: false }));
+        setLoadError(err);
+      });
+  }, [incidentForAlertProcessing, rules, daysSpan]);
 
   useEffect(() => {
     if (!isInitialized) return;
@@ -293,30 +296,34 @@ const IncidentsPage = () => {
         ? incidentsActiveFilters.days[0].split(' ')[0] + 'd'
         : '',
     );
-    const calculatedTimeRanges = getIncidentsTimeRanges(daysDuration, currentTime);
 
     const isGroupSelected = !!selectedGroupId;
     const incidentsQuery = isGroupSelected
       ? `cluster_health_components_map{group_id='${selectedGroupId}'}`
       : 'cluster_health_components_map';
 
+    // Always fetch 15 days of data so firstTimestamp is computed from full history
+    const fetchTimeRanges = getIncidentsTimeRanges(15 * DAY_MS, currentTime);
+
     Promise.all(
-      calculatedTimeRanges.map(async (range) => {
+      fetchTimeRanges.map(async (range) => {
         const response = await fetchDataForIncidentsAndAlerts(safeFetch, range, incidentsQuery);
         return response.data.result;
       }),
     )
-      .then((results) => {
-        const prometheusResults = results.flat();
-        const incidents = convertToIncidents(prometheusResults, currentTime);
+      .then((incidentsResults) => {
+        const prometheusResults = incidentsResults.flat();
+        const incidents = convertToIncidents(prometheusResults, currentTime, daysDuration);
 
         // Update the raw, unfiltered incidents state
         dispatch(setIncidents({ incidents }));
 
+        const filteredData = filterIncident(incidentsActiveFilters, incidents);
+
         // Filter the incidents and dispatch
         dispatch(
           setFilteredIncidentsData({
-            filteredIncidentsData: filterIncident(incidentsActiveFilters, incidents),
+            filteredIncidentsData: filteredData,
           }),
         );
 

web/src/components/Incidents/IncidentsTable.tsx

@@ -95,7 +95,7 @@ export const IncidentsTable = () => {
     if (!alert.alertsExpandedRowData || alert.alertsExpandedRowData.length === 0) {
       return 0;
     }
-    return Math.min(...alert.alertsExpandedRowData.map((alertData) => alertData.alertsStartFiring));
+    return Math.min(...alert.alertsExpandedRowData.map((alertData) => alertData.firstTimestamp));
   };
 
   if (isEmpty(alertsTableData) || alertsAreLoading || isEmpty(incidentsActiveFilters.groupId)) {
@@ -180,7 +180,9 @@ export const IncidentsTable = () => {
                       )}
                     </Td>
                     <Td dataLabel={columnNames.startDate}>
-                      <Timestamp timestamp={String(getMinStartDate(alert) * 1000)} />
+                      <Timestamp
+                        timestamp={new Date(getMinStartDate(alert) * 1000).toISOString()}
+                      />
                     </Td>
                     <Td
                       dataLabel={columnNames.state}

web/src/components/Incidents/model.ts

@@ -4,7 +4,7 @@ export type Timestamps = [number, string];
 
 export type SpanDates = Array<number>;
 
-export type AlertsIntervalsArray = [number, number, 'data' | 'nodata'];
+export type AlertsIntervalsArray = [number, number, 'data' | 'nodata', number?];
 
 export type Incident = {
   component: string;
@@ -15,10 +15,12 @@ export type Incident = {
   src_severity: string;
   src_alertname: string;
   src_namespace: string;
+  severity: any;
   silenced: boolean;
   x: number;
   values: Array<Timestamps>;
   metric: Metric;
+  firstTimestamp: number;
 };
 
 // Define the interface for Metric
@@ -47,6 +49,7 @@ export type Alert = {
   severity: Severity;
   silenced: boolean;
   x: number;
+  firstTimestamp: number;
   values: Array<Timestamps>;
   alertsExpandedRowData?: Array<Alert>;
 };
@@ -101,6 +104,7 @@ export type IncidentsDetailsAlert = {
   resolved: boolean;
   severity: Severity;
   x: number;
+  firstTimestamp: number;
   values: Array<Timestamps>;
   silenced: boolean;
   rule: {