Alerting: Alert rules pagination (#50612)

packages/grafana-ui/src/components/Pagination/Pagination.tsx

@@ -1,4 +1,4 @@
-import { css } from '@emotion/css';
+import { css, cx } from '@emotion/css';
 import React, { useMemo } from 'react';
 
 import { useStyles2 } from '../../themes';
@@ -16,6 +16,7 @@ export interface Props {
   hideWhenSinglePage?: boolean;
   /** Small version only shows the current page and the navigation buttons. */
   showSmallVersion?: boolean;
+  className?: string;
 }
 
 export const Pagination: React.FC<Props> = ({
@@ -24,6 +25,7 @@ export const Pagination: React.FC<Props> = ({
   onNavigate,
   hideWhenSinglePage,
   showSmallVersion,
+  className,
 }) => {
   const styles = useStyles2(getStyles);
   const pageLengthToCondense = showSmallVersion ? 1 : 8;
@@ -96,7 +98,7 @@ export const Pagination: React.FC<Props> = ({
   }
 
   return (
-    <div className={styles.container}>
+    <div className={cx(styles.container, className)}>
       <ol>
         <li className={styles.item}>
           <Button

public/app/features/alerting/unified/RuleViewer.tsx

@@ -15,6 +15,7 @@ import {
 } from '@grafana/ui';
 import { GrafanaRouteComponentProps } from 'app/core/navigation/types';
 
+import { DEFAULT_PER_PAGE_PAGINATION } from '../../../core/constants';
 import { AlertQuery } from '../../../types/unified-alerting-dto';
 
 import { AlertLabels } from './components/AlertLabels';
@@ -179,7 +180,7 @@ export function RuleViewer({ match }: RuleViewerProps) {
           </div>
         </div>
         <div>
-          <RuleDetailsMatchingInstances rule={rule} />
+          <RuleDetailsMatchingInstances rule={rule} pagination={{ itemsPerPage: DEFAULT_PER_PAGE_PAGINATION }} />
         </div>
       </RuleViewerLayoutContent>
       {!isFederatedRule && data && Object.keys(data).length > 0 && (

public/app/features/alerting/unified/components/DynamicTable.tsx

@@ -2,7 +2,14 @@ import { css, cx } from '@emotion/css';
 import React, { ReactNode, useState } from 'react';
 
 import { GrafanaTheme2 } from '@grafana/data';
-import { IconButton, useStyles2 } from '@grafana/ui';
+import { IconButton, Pagination, useStyles2 } from '@grafana/ui';
+
+import { usePagination } from '../hooks/usePagination';
+import { getPaginationStyles } from '../styles/pagination';
+
+interface DynamicTablePagination {
+  itemsPerPage: number;
+}
 
 export interface DynamicTableColumnProps<T = unknown> {
   id: string | number;
@@ -23,6 +30,8 @@ export interface DynamicTableProps<T = unknown> {
   items: Array<DynamicTableItemProps<T>>;
 
   isExpandable?: boolean;
+  pagination?: DynamicTablePagination;
+  paginationStyles?: string;
 
   // provide these to manually control expanded status
   onCollapse?: (item: DynamicTableItemProps<T>) => void;
@@ -41,6 +50,8 @@ export interface DynamicTableProps<T = unknown> {
     index: number,
     items: Array<DynamicTableItemProps<T>>
   ) => ReactNode;
+
+  footerRow?: JSX.Element;
 }
 
 export const DynamicTable = <T extends object>({
@@ -52,12 +63,16 @@ export const DynamicTable = <T extends object>({
   isExpanded,
   renderExpandedContent,
   testIdGenerator,
-
+  pagination,
+  paginationStyles,
   // render a cell BEFORE expand icon for header/ each row.
   // currently use by RuleList to render guidelines
   renderPrefixCell,
   renderPrefixHeader,
+  footerRow,
 }: DynamicTableProps<T>) => {
+  const defaultPaginationStyles = useStyles2(getPaginationStyles);
+
   if ((onCollapse || onExpand || isExpanded) && !(onCollapse && onExpand && isExpanded)) {
     throw new Error('either all of onCollapse, onExpand, isExpanded must be provided, or none');
   }
@@ -77,50 +92,70 @@ export const DynamicTable = <T extends object>({
       );
     }
   };
+
+  const itemsPerPage = pagination?.itemsPerPage ?? items.length;
+  const { page, numberOfPages, onPageChange, pageItems } = usePagination(items, 1, itemsPerPage);
+
   return (
-    <div className={styles.container} data-testid="dynamic-table">
-      <div className={styles.row} data-testid="header">
-        {renderPrefixHeader && renderPrefixHeader()}
-        {isExpandable && <div className={styles.cell} />}
-        {cols.map((col) => (
-          <div className={styles.cell} key={col.id}>
-            {col.label}
-          </div>
-        ))}
-      </div>
+    <>
+      <div className={styles.container} data-testid="dynamic-table">
+        <div className={styles.row} data-testid="header">
+          {renderPrefixHeader && renderPrefixHeader()}
+          {isExpandable && <div className={styles.cell} />}
+          {cols.map((col) => (
+            <div className={styles.cell} key={col.id}>
+              {col.label}
+            </div>
+          ))}
+        </div>
 
-      {items.map((item, index) => {
-        const isItemExpanded = isExpanded ? isExpanded(item) : expandedIds.includes(item.id);
-        return (
-          <div className={styles.row} key={`${item.id}-${index}`} data-testid={testIdGenerator?.(item, index) ?? 'row'}>
-            {renderPrefixCell && renderPrefixCell(item, index, items)}
-            {isExpandable && (
-              <div className={cx(styles.cell, styles.expandCell)}>
-                <IconButton
-                  aria-label={`${isItemExpanded ? 'Collapse' : 'Expand'} row`}
-                  size="xl"
-                  data-testid="collapse-toggle"
-                  className={styles.expandButton}
-                  name={isItemExpanded ? 'angle-down' : 'angle-right'}
-                  onClick={() => toggleExpanded(item)}
-                  type="button"
-                />
-              </div>
-            )}
-            {cols.map((col) => (
-              <div className={cx(styles.cell, styles.bodyCell)} data-column={col.label} key={`${item.id}-${col.id}`}>
-                {col.renderCell(item, index)}
-              </div>
-            ))}
-            {isItemExpanded && renderExpandedContent && (
-              <div className={styles.expandedContentRow} data-testid="expanded-content">
-                {renderExpandedContent(item, index, items)}
-              </div>
-            )}
-          </div>
-        );
-      })}
-    </div>
+        {pageItems.map((item, index) => {
+          const isItemExpanded = isExpanded ? isExpanded(item) : expandedIds.includes(item.id);
+          return (
+            <div
+              className={styles.row}
+              key={`${item.id}-${index}`}
+              data-testid={testIdGenerator?.(item, index) ?? 'row'}
+            >
+              {renderPrefixCell && renderPrefixCell(item, index, items)}
+              {isExpandable && (
+                <div className={cx(styles.cell, styles.expandCell)}>
+                  <IconButton
+                    aria-label={`${isItemExpanded ? 'Collapse' : 'Expand'} row`}
+                    size="xl"
+                    data-testid="collapse-toggle"
+                    className={styles.expandButton}
+                    name={isItemExpanded ? 'angle-down' : 'angle-right'}
+                    onClick={() => toggleExpanded(item)}
+                    type="button"
+                  />
+                </div>
+              )}
+              {cols.map((col) => (
+                <div className={cx(styles.cell, styles.bodyCell)} data-column={col.label} key={`${item.id}-${col.id}`}>
+                  {col.renderCell(item, index)}
+                </div>
+              ))}
+              {isItemExpanded && renderExpandedContent && (
+                <div className={styles.expandedContentRow} data-testid="expanded-content">
+                  {renderExpandedContent(item, index, items)}
+                </div>
+              )}
+            </div>
+          );
+        })}
+        {footerRow && <div className={cx(styles.row, styles.footerRow)}>{footerRow}</div>}
+      </div>
+      {pagination && (
+        <Pagination
+          className={cx(defaultPaginationStyles, paginationStyles)}
+          currentPage={page}
+          numberOfPages={numberOfPages}
+          onNavigate={onPageChange}
+          hideWhenSinglePage
+        />
+      )}
+    </>
   );
 };
 
@@ -186,6 +221,10 @@ const getStyles = <T extends unknown>(
           : ''}
       }
     `,
+    footerRow: css`
+      display: flex;
+      padding: ${theme.spacing(1)};
+    `,
     cell: css`
       align-items: center;
       padding: ${theme.spacing(1)};
@@ -197,6 +236,7 @@ const getStyles = <T extends unknown>(
     `,
     bodyCell: css`
       overflow: hidden;
+
       ${theme.breakpoints.down('sm')} {
         grid-column-end: right;
         grid-column-start: right;

public/app/features/alerting/unified/components/rules/AlertInstanceStateFilter.tsx

@@ -1,7 +1,9 @@
+import { css } from '@emotion/css';
 import { capitalize } from 'lodash';
-import React, { useMemo } from 'react';
+import React from 'react';
 
-import { Label, RadioButtonGroup } from '@grafana/ui';
+import { GrafanaTheme2 } from '@grafana/data/src';
+import { Label, RadioButtonGroup, Tag, useStyles2 } from '@grafana/ui';
 import { GrafanaAlertState, PromAlertingRuleState } from 'app/types/unified-alerting-dto';
 
 export type InstanceStateFilter = GrafanaAlertState | PromAlertingRuleState.Pending | PromAlertingRuleState.Firing;
@@ -11,21 +13,40 @@ interface Props {
   filterType: 'grafana' | 'prometheus';
   stateFilter?: InstanceStateFilter;
   onStateFilterChange: (value?: InstanceStateFilter) => void;
+  itemPerStateStats?: Record<string, number>;
 }
 
-const grafanaOptions = Object.values(GrafanaAlertState).map((value) => ({
-  label: value,
-  value,
-}));
+export const AlertInstanceStateFilter = ({
+  className,
+  onStateFilterChange,
+  stateFilter,
+  filterType,
+  itemPerStateStats,
+}: Props) => {
+  const styles = useStyles2(getStyles);
 
-const promOptionValues = [PromAlertingRuleState.Firing, PromAlertingRuleState.Pending] as const;
-const promOptions = promOptionValues.map((state) => ({
-  label: capitalize(state),
-  value: state,
-}));
+  const getOptionComponent = (state: InstanceStateFilter) => {
+    return function InstanceStateCounter() {
+      return itemPerStateStats && itemPerStateStats[state] ? (
+        <Tag name={itemPerStateStats[state].toFixed(0)} colorIndex={9} className={styles.tag} />
+      ) : null;
+    };
+  };
 
-export const AlertInstanceStateFilter = ({ className, onStateFilterChange, stateFilter, filterType }: Props) => {
-  const stateOptions = useMemo(() => (filterType === 'grafana' ? grafanaOptions : promOptions), [filterType]);
+  const grafanaOptions = Object.values(GrafanaAlertState).map((state) => ({
+    label: state,
+    value: state,
+    component: getOptionComponent(state),
+  }));
+
+  const promOptionValues = [PromAlertingRuleState.Firing, PromAlertingRuleState.Pending] as const;
+  const promOptions = promOptionValues.map((state) => ({
+    label: capitalize(state),
+    value: state,
+    component: getOptionComponent(state),
+  }));
+
+  const stateOptions = filterType === 'grafana' ? grafanaOptions : promOptions;
 
   return (
     <div className={className} data-testid="alert-instance-state-filter">
@@ -43,3 +64,15 @@ export const AlertInstanceStateFilter = ({ className, onStateFilterChange, state
     </div>
   );
 };
+
+function getStyles(theme: GrafanaTheme2) {
+  return {
+    tag: css`
+      font-size: 11px;
+      font-weight: normal;
+      padding: ${theme.spacing(0.25, 0.5)};
+      vertical-align: middle;
+      margin-left: ${theme.spacing(0.5)};
+    `,
+  };
+}

public/app/features/alerting/unified/components/rules/AlertInstancesTable.tsx

@@ -1,8 +1,6 @@
-import { css } from '@emotion/css';
 import React, { FC, useMemo } from 'react';
 
-import { GrafanaTheme2 } from '@grafana/data';
-import { Alert } from 'app/types/unified-alerting';
+import { Alert, PaginationProps } from 'app/types/unified-alerting';
 
 import { alertInstanceKey } from '../../utils/rules';
 import { AlertLabels } from '../AlertLabels';
@@ -13,12 +11,14 @@ import { AlertStateTag } from './AlertStateTag';
 
 interface Props {
   instances: Alert[];
+  pagination?: PaginationProps;
+  footerRow?: JSX.Element;
 }
 
 type AlertTableColumnProps = DynamicTableColumnProps<Alert>;
 type AlertTableItemProps = DynamicTableItemProps<Alert>;
 
-export const AlertInstancesTable: FC<Props> = ({ instances }) => {
+export const AlertInstancesTable: FC<Props> = ({ instances, pagination, footerRow }) => {
   const items = useMemo(
     (): AlertTableItemProps[] =>
       instances.map((instance) => ({
@@ -34,33 +34,12 @@ export const AlertInstancesTable: FC<Props> = ({ instances }) => {
       isExpandable={true}
       items={items}
       renderExpandedContent={({ data }) => <AlertInstanceDetails instance={data} />}
+      pagination={pagination}
+      footerRow={footerRow}
     />
   );
 };
 
-export const getStyles = (theme: GrafanaTheme2) => ({
-  colExpand: css`
-    width: 36px;
-  `,
-  colState: css`
-    width: 110px;
-  `,
-  labelsCell: css`
-    padding-top: ${theme.spacing(0.5)} !important;
-    padding-bottom: ${theme.spacing(0.5)} !important;
-  `,
-  createdCell: css`
-    white-space: nowrap;
-  `,
-  table: css`
-    td {
-      vertical-align: top;
-      padding-top: ${theme.spacing(1)};
-      padding-bottom: ${theme.spacing(1)};
-    }
-  `,
-});
-
 const columns: AlertTableColumnProps[] = [
   {
     id: 'state',

public/app/features/alerting/unified/components/rules/CloudRules.tsx

@@ -2,14 +2,18 @@ import { css } from '@emotion/css';
 import pluralize from 'pluralize';
 import React, { FC, useMemo } from 'react';
 
-import { GrafanaTheme } from '@grafana/data';
-import { LoadingPlaceholder, useStyles } from '@grafana/ui';
+import { GrafanaTheme2 } from '@grafana/data';
+import { LoadingPlaceholder, Pagination, useStyles2 } from '@grafana/ui';
 import { CombinedRuleNamespace } from 'app/types/unified-alerting';
 
+import { DEFAULT_PER_PAGE_PAGINATION } from '../../../../../core/constants';
+import { usePagination } from '../../hooks/usePagination';
 import { useUnifiedAlertingSelector } from '../../hooks/useUnifiedAlertingSelector';
-import { getRulesDataSources, getRulesSourceName } from '../../utils/datasource';
+import { getPaginationStyles } from '../../styles/pagination';
+import { getRulesDataSources, getRulesSourceUid } from '../../utils/datasource';
 
 import { RulesGroup } from './RulesGroup';
+import { useCombinedGroupNamespace } from './useCombinedGroupNamespace';
 
 interface Props {
   namespaces: CombinedRuleNamespace[];
@@ -17,15 +21,23 @@ interface Props {
 }
 
 export const CloudRules: FC<Props> = ({ namespaces, expandAll }) => {
-  const styles = useStyles(getStyles);
+  const styles = useStyles2(getStyles);
+
   const rules = useUnifiedAlertingSelector((state) => state.promRules);
   const rulesDataSources = useMemo(getRulesDataSources, []);
+  const groupsWithNamespaces = useCombinedGroupNamespace(namespaces);
 
   const dataSourcesLoading = useMemo(
     () => rulesDataSources.filter((ds) => rules[ds.name]?.loading),
     [rules, rulesDataSources]
   );
 
+  const { numberOfPages, onPageChange, page, pageItems } = usePagination(
+    groupsWithNamespaces,
+    1,
+    DEFAULT_PER_PAGE_PAGINATION
+  );
+
   return (
     <section className={styles.wrapper}>
       <div className={styles.sectionHeader}>
@@ -40,24 +52,30 @@ export const CloudRules: FC<Props> = ({ namespaces, expandAll }) => {
         )}
       </div>
 
-      {namespaces.map((namespace) => {
-        const { groups, rulesSource } = namespace;
-        return groups.map((group) => (
+      {pageItems.map(({ group, namespace }) => {
+        return (
           <RulesGroup
             group={group}
-            key={`${getRulesSourceName(rulesSource)}-${name}-${group.name}`}
+            key={`${getRulesSourceUid(namespace.rulesSource)}-${namespace.name}-${group.name}`}
             namespace={namespace}
             expandAll={expandAll}
           />
-        ));
+        );
       })}
       {namespaces?.length === 0 && !!rulesDataSources.length && <p>No rules found.</p>}
-      {!rulesDataSources.length && <p>There are no Prometheus or Loki datas sources configured.</p>}
+      {!rulesDataSources.length && <p>There are no Prometheus or Loki data sources configured.</p>}
+      <Pagination
+        className={styles.pagination}
+        currentPage={page}
+        numberOfPages={numberOfPages}
+        onNavigate={onPageChange}
+        hideWhenSinglePage
+      />
     </section>
   );
 };
 
-const getStyles = (theme: GrafanaTheme) => ({
+const getStyles = (theme: GrafanaTheme2) => ({
   loader: css`
     margin-bottom: 0;
   `,
@@ -66,6 +84,7 @@ const getStyles = (theme: GrafanaTheme) => ({
     justify-content: space-between;
   `,
   wrapper: css`
-    margin-bottom: ${theme.spacing.xl};
+    margin-bottom: ${theme.spacing(4)};
   `,
+  pagination: getPaginationStyles(theme),
 });

public/app/features/alerting/unified/components/rules/GrafanaRules.tsx

@@ -1,17 +1,21 @@
 import { css } from '@emotion/css';
 import React, { FC } from 'react';
 
-import { GrafanaTheme } from '@grafana/data';
-import { LoadingPlaceholder, useStyles } from '@grafana/ui';
+import { GrafanaTheme2 } from '@grafana/data';
+import { LoadingPlaceholder, Pagination, useStyles2 } from '@grafana/ui';
 import { useQueryParams } from 'app/core/hooks/useQueryParams';
 import { CombinedRuleNamespace } from 'app/types/unified-alerting';
 
+import { DEFAULT_PER_PAGE_PAGINATION } from '../../../../../core/constants';
 import { flattenGrafanaManagedRules } from '../../hooks/useCombinedRuleNamespaces';
+import { usePagination } from '../../hooks/usePagination';
 import { useUnifiedAlertingSelector } from '../../hooks/useUnifiedAlertingSelector';
+import { getPaginationStyles } from '../../styles/pagination';
 import { GRAFANA_RULES_SOURCE_NAME } from '../../utils/datasource';
 import { initialAsyncRequestState } from '../../utils/redux';
 
 import { RulesGroup } from './RulesGroup';
+import { useCombinedGroupNamespace } from './useCombinedGroupNamespace';
 
 interface Props {
   namespaces: CombinedRuleNamespace[];
@@ -19,7 +23,7 @@ interface Props {
 }
 
 export const GrafanaRules: FC<Props> = ({ namespaces, expandAll }) => {
-  const styles = useStyles(getStyles);
+  const styles = useStyles2(getStyles);
   const [queryParams] = useQueryParams();
 
   const { loading } = useUnifiedAlertingSelector(
@@ -29,6 +33,14 @@ export const GrafanaRules: FC<Props> = ({ namespaces, expandAll }) => {
   const wantsGroupedView = queryParams['view'] === 'grouped';
   const namespacesFormat = wantsGroupedView ? namespaces : flattenGrafanaManagedRules(namespaces);
 
+  const groupsWithNamespaces = useCombinedGroupNamespace(namespacesFormat);
+
+  const { numberOfPages, onPageChange, page, pageItems } = usePagination(
+    groupsWithNamespaces,
+    1,
+    DEFAULT_PER_PAGE_PAGINATION
+  );
+
   return (
     <section className={styles.wrapper}>
       <div className={styles.sectionHeader}>
@@ -36,22 +48,22 @@ export const GrafanaRules: FC<Props> = ({ namespaces, expandAll }) => {
         {loading ? <LoadingPlaceholder className={styles.loader} text="Loading..." /> : <div />}
       </div>
 
-      {namespacesFormat?.map((namespace) =>
-        namespace.groups.map((group) => (
-          <RulesGroup
-            group={group}
-            key={`${namespace.name}-${group.name}`}
-            namespace={namespace}
-            expandAll={expandAll}
-          />
-        ))
-      )}
+      {pageItems.map(({ group, namespace }) => (
+        <RulesGroup group={group} key={`${namespace.name}-${group.name}`} namespace={namespace} expandAll={expandAll} />
+      ))}
       {namespacesFormat?.length === 0 && <p>No rules found.</p>}
+      <Pagination
+        className={styles.pagination}
+        currentPage={page}
+        numberOfPages={numberOfPages}
+        onNavigate={onPageChange}
+        hideWhenSinglePage
+      />
     </section>
   );
 };
 
-const getStyles = (theme: GrafanaTheme) => ({
+const getStyles = (theme: GrafanaTheme2) => ({
   loader: css`
     margin-bottom: 0;
   `,
@@ -60,6 +72,7 @@ const getStyles = (theme: GrafanaTheme) => ({
     justify-content: space-between;
   `,
   wrapper: css`
-    margin-bottom: ${theme.spacing.xl};
+    margin-bottom: ${theme.spacing(4)};
   `,
+  pagination: getPaginationStyles(theme),
 });

public/app/features/alerting/unified/components/rules/RuleDetails.tsx

@@ -18,6 +18,11 @@ interface Props {
   rule: CombinedRule;
 }
 
+// The limit is set to 15 in order to upkeep the good performance
+// and to encourage users to go to the rule details page to see the rest of the instances
+// We don't want to paginate the instances list on the alert list page
+const INSTANCES_DISPLAY_LIMIT = 15;
+
 export const RuleDetails: FC<Props> = ({ rule }) => {
   const styles = useStyles2(getStyles);
   const {
@@ -43,7 +48,7 @@ export const RuleDetails: FC<Props> = ({ rule }) => {
           <RuleDetailsDataSources rulesSource={rulesSource} rule={rule} />
         </div>
       </div>
-      <RuleDetailsMatchingInstances rule={rule} />
+      <RuleDetailsMatchingInstances rule={rule} itemsDisplayLimit={INSTANCES_DISPLAY_LIMIT} />
     </div>
   );
 };

public/app/features/alerting/unified/components/rules/RuleDetailsMatchingInstances.test.tsx

@@ -14,15 +14,15 @@ const ui = {
   stateFilter: byTestId('alert-instance-state-filter'),
   stateButton: byRole('radio'),
   grafanaStateButton: {
-    normal: byLabelText('Normal'),
-    alerting: byLabelText('Alerting'),
-    pending: byLabelText('Pending'),
-    noData: byLabelText('NoData'),
-    error: byLabelText('Error'),
+    normal: byLabelText(/^Normal/),
+    alerting: byLabelText(/^Alerting/),
+    pending: byLabelText(/^Pending/),
+    noData: byLabelText(/^NoData/),
+    error: byLabelText(/^Error/),
   },
   cloudStateButton: {
-    firing: byLabelText('Firing'),
-    pending: byLabelText('Pending'),
+    firing: byLabelText(/^Firing/),
+    pending: byLabelText(/^Pending/),
   },
   instanceRow: byTestId('row'),
 };

public/app/features/alerting/unified/components/rules/RuleDetailsMatchingInstances.tsx

@@ -1,17 +1,18 @@
 import { css, cx } from '@emotion/css';
+import { countBy } from 'lodash';
 import React, { useMemo, useState } from 'react';
 
 import { GrafanaTheme } from '@grafana/data';
-import { useStyles } from '@grafana/ui';
+import { LinkButton, useStyles } from '@grafana/ui';
 import { MatcherFilter } from 'app/features/alerting/unified/components/alert-groups/MatcherFilter';
 import {
   AlertInstanceStateFilter,
   InstanceStateFilter,
 } from 'app/features/alerting/unified/components/rules/AlertInstanceStateFilter';
 import { labelsMatchMatchers, parseMatchers } from 'app/features/alerting/unified/utils/alertmanager';
-import { sortAlerts } from 'app/features/alerting/unified/utils/misc';
+import { createViewLink, sortAlerts } from 'app/features/alerting/unified/utils/misc';
 import { SortOrder } from 'app/plugins/panel/alertlist/types';
-import { Alert, CombinedRule } from 'app/types/unified-alerting';
+import { Alert, CombinedRule, PaginationProps } from 'app/types/unified-alerting';
 import { mapStateWithReasonToBaseState } from 'app/types/unified-alerting-dto';
 
 import { GRAFANA_RULES_SOURCE_NAME, isGrafanaRulesSource } from '../../utils/datasource';
@@ -20,13 +21,40 @@ import { DetailsField } from '../DetailsField';
 
 import { AlertInstancesTable } from './AlertInstancesTable';
 
-type Props = {
+interface Props {
   rule: CombinedRule;
-};
+  pagination?: PaginationProps;
+  itemsDisplayLimit?: number;
+}
+
+interface ShowMoreStats {
+  totalItemsCount: number;
+  visibleItemsCount: number;
+}
+
+function ShowMoreInstances(props: { ruleViewPageLink: string; stats: ShowMoreStats }) {
+  const styles = useStyles(getStyles);
+  const { ruleViewPageLink, stats } = props;
+
+  return (
+    <div className={styles.footerRow}>
+      <div>
+        Showing {stats.visibleItemsCount} out of {stats.totalItemsCount} instances
+      </div>
+      {ruleViewPageLink && (
+        <LinkButton href={ruleViewPageLink} size="sm" variant="secondary">
+          Show all {stats.totalItemsCount} alert instances
+        </LinkButton>
+      )}
+    </div>
+  );
+}
 
 export function RuleDetailsMatchingInstances(props: Props): JSX.Element | null {
   const {
     rule: { promRule, namespace },
+    itemsDisplayLimit = Number.POSITIVE_INFINITY,
+    pagination,
   } = props;
 
   const [queryString, setQueryString] = useState<string>();
@@ -52,6 +80,22 @@ export function RuleDetailsMatchingInstances(props: Props): JSX.Element | null {
     return null;
   }
 
+  const visibleInstances = alerts.slice(0, itemsDisplayLimit);
+
+  const countAllByState = countBy(promRule.alerts, (alert) => mapStateWithReasonToBaseState(alert.state));
+  const hiddenItemsCount = alerts.length - visibleInstances.length;
+
+  const stats: ShowMoreStats = {
+    totalItemsCount: alerts.length,
+    visibleItemsCount: visibleInstances.length,
+  };
+
+  const ruleViewPageLink = createViewLink(namespace.rulesSource, props.rule, location.pathname + location.search);
+
+  const footerRow = hiddenItemsCount ? (
+    <ShowMoreInstances stats={stats} ruleViewPageLink={ruleViewPageLink} />
+  ) : undefined;
+
   return (
     <DetailsField label="Matching instances" horizontal={true}>
       <div className={cx(styles.flexRow, styles.spaceBetween)}>
@@ -67,11 +111,12 @@ export function RuleDetailsMatchingInstances(props: Props): JSX.Element | null {
             filterType={stateFilterType}
             stateFilter={alertState}
             onStateFilterChange={setAlertState}
+            itemPerStateStats={countAllByState}
           />
         </div>
       </div>
 
-      <AlertInstancesTable instances={alerts} />
+      <AlertInstancesTable instances={visibleInstances} pagination={pagination} footerRow={footerRow} />
     </DetailsField>
   );
 }
@@ -111,5 +156,13 @@ const getStyles = (theme: GrafanaTheme) => {
     rowChild: css`
       margin-right: ${theme.spacing.sm};
     `,
+    footerRow: css`
+      display: flex;
+      flex-direction: column;
+      gap: ${theme.spacing.sm};
+      justify-content: space-between;
+      align-items: center;
+      width: 100%;
+    `,
   };
 };

public/app/features/alerting/unified/components/rules/RulesTable.tsx

@@ -5,6 +5,7 @@ import { GrafanaTheme2 } from '@grafana/data';
 import { useStyles2 } from '@grafana/ui';
 import { CombinedRule } from 'app/types/unified-alerting';
 
+import { DEFAULT_PER_PAGE_PAGINATION } from '../../../../../core/constants';
 import { useHasRuler } from '../../hooks/useHasRuler';
 import { Annotation } from '../../utils/constants';
 import { isGrafanaRulerRule } from '../../utils/rules';
@@ -71,6 +72,8 @@ export const RulesTable: FC<Props> = ({
         isExpandable={true}
         items={items}
         renderExpandedContent={({ data: rule }) => <RuleDetails rule={rule} />}
+        pagination={{ itemsPerPage: DEFAULT_PER_PAGE_PAGINATION }}
+        paginationStyles={styles.pagination}
       />
     </div>
   );
@@ -87,9 +90,18 @@ export const getStyles = (theme: GrafanaTheme2) => ({
   `,
   wrapper: css`
     width: auto;
-    background-color: ${theme.colors.background.secondary};
     border-radius: ${theme.shape.borderRadius()};
   `,
+  pagination: css`
+    display: flex;
+    margin: 0;
+    padding-top: ${theme.spacing(1)};
+    padding-bottom: ${theme.spacing(0.25)};
+    justify-content: center;
+    border-left: 1px solid ${theme.colors.border.strong};
+    border-right: 1px solid ${theme.colors.border.strong};
+    border-bottom: 1px solid ${theme.colors.border.strong};
+  `,
 });
 
 function useColumns(showSummaryColumn: boolean, showGroupColumn: boolean) {

public/app/features/alerting/unified/components/rules/useCombinedGroupNamespace.tsx

@@ -0,0 +1,16 @@
+import { useMemo } from 'react';
+
+import { CombinedRuleNamespace } from '../../../../../types/unified-alerting';
+
+export function useCombinedGroupNamespace(namespaces: CombinedRuleNamespace[]) {
+  return useMemo(
+    () =>
+      namespaces.flatMap((ns) =>
+        ns.groups.map((g) => ({
+          namespace: ns,
+          group: g,
+        }))
+      ),
+    [namespaces]
+  );
+}

public/app/features/alerting/unified/hooks/usePagination.ts

@@ -1,18 +1,24 @@
-import { useEffect, useState } from 'react';
+import { useCallback, useEffect, useMemo, useState } from 'react';
 
 export function usePagination<T>(items: T[], initialPage: number, itemsPerPage: number) {
   const [page, setPage] = useState(initialPage);
 
   const numberOfPages = Math.ceil(items.length / itemsPerPage);
-
   const firstItemOnPageIndex = itemsPerPage * (page - 1);
-  const pageItems = items.slice(firstItemOnPageIndex, firstItemOnPageIndex + itemsPerPage);
 
-  const onPageChange = (newPage: number) => {
-    setPage(newPage);
-  };
+  const pageItems = useMemo(
+    () => items.slice(firstItemOnPageIndex, firstItemOnPageIndex + itemsPerPage),
+    [items, firstItemOnPageIndex, itemsPerPage]
+  );
+
+  const onPageChange = useCallback(
+    (newPage: number) => {
+      setPage(newPage);
+    },
+    [setPage]
+  );
 
-  // Reset the current page when number of changes has been changed
+  // Reset the current page when number of pages has been changed
   useEffect(() => setPage(1), [numberOfPages]);
 
   return { page, onPageChange, numberOfPages, pageItems };

public/app/features/alerting/unified/styles/pagination.ts

@@ -0,0 +1,12 @@
+import { css } from '@emotion/css';
+
+import { GrafanaTheme2 } from '@grafana/data/src';
+
+export const getPaginationStyles = (theme: GrafanaTheme2) => {
+  return css`
+    float: none;
+    display: flex;
+    justify-content: flex-start;
+    margin: ${theme.spacing(2, 0)};
+  `;
+};

public/app/features/alerting/unified/utils/datasource.ts

@@ -123,6 +123,10 @@ export function getRulesSourceName(rulesSource: RulesSource): string {
   return isCloudRulesSource(rulesSource) ? rulesSource.name : rulesSource;
 }
 
+export function getRulesSourceUid(rulesSource: RulesSource): string {
+  return isCloudRulesSource(rulesSource) ? rulesSource.uid : GRAFANA_RULES_SOURCE_NAME;
+}
+
 export function isCloudRulesSource(rulesSource: RulesSource | string): rulesSource is DataSourceInstanceSettings {
   return rulesSource !== GRAFANA_RULES_SOURCE_NAME;
 }

public/app/plugins/panel/alertlist/AlertInstances.tsx

@@ -9,6 +9,8 @@ import { AlertInstancesTable } from 'app/features/alerting/unified/components/ru
 import { sortAlerts } from 'app/features/alerting/unified/utils/misc';
 import { Alert } from 'app/types/unified-alerting';
 
+import { DEFAULT_PER_PAGE_PAGINATION } from '../../../core/constants';
+
 import { GroupMode, UnifiedAlertListOptions } from './types';
 import { filterAlerts } from './util';
 
@@ -52,7 +54,12 @@ export const AlertInstances: FC<Props> = ({ alerts, options }) => {
           {hiddenInstances > 0 && <span>, {`${hiddenInstances} hidden by filters`}</span>}
         </div>
       )}
-      {displayInstances && <AlertInstancesTable instances={filteredAlerts} />}
+      {displayInstances && (
+        <AlertInstancesTable
+          instances={filteredAlerts}
+          pagination={{ itemsPerPage: 2 * DEFAULT_PER_PAGE_PAGINATION }}
+        />
+      )}
     </div>
   );
 };

public/app/types/unified-alerting.ts

@@ -193,3 +193,7 @@ export interface PromBasedDataSource {
   id: string | number;
   rulerConfig?: RulerDataSourceConfig;
 }
+
+export interface PaginationProps {
+  itemsPerPage: number;
+}