Elastic UI Design System.

import React, { useState } from "react";
import { createRoot } from "react-dom/client";
import {
  EuiProvider,
  EuiPanel,
  EuiTitle,
  EuiText,
  EuiSpacer,
  EuiFlexGroup,
  EuiFlexItem,
  EuiFieldSearch,
  EuiButtonGroup,
  EuiButtonEmpty,
  EuiBasicTable,
  EuiHealth,
  EuiStat,
  EuiSwitch,
  EuiCallOut,
  useEuiTheme,
} from "@elastic/eui";
const logs = [
  {
    id: 1,
    time: "09:42:18",
    service: "gateway",
    message: "Request completed",
    level: "Info",
    duration: 42,
  },
  {
    id: 2,
    time: "09:42:21",
    service: "worker",
    message: "Retry queued after timeout",
    level: "Warning",
    duration: 1200,
  },
  {
    id: 3,
    time: "09:42:24",
    service: "gateway",
    message: "Upstream connection refused",
    level: "Error",
    duration: 800,
  },
  {
    id: 4,
    time: "09:42:29",
    service: "indexer",
    message: "Batch indexed",
    level: "Info",
    duration: 180,
  },
  {
    id: 5,
    time: "09:42:32",
    service: "worker",
    message: "Job completed",
    level: "Info",
    duration: 94,
  },
  {
    id: 6,
    time: "09:42:36",
    service: "gateway",
    message: "Upstream connection restored",
    level: "Info",
    duration: 51,
  },
];
function Screen({ dark, setDark }) {
  const { euiTheme } = useEuiTheme();
  const [query, setQuery] = useState(""),
    [level, setLevel] = useState("all"),
    [saved, setSaved] = useState([]);
  const visible = logs.filter(
    (x) =>
      (level === "all" || x.level === level) &&
      (x.service + " " + x.message).toLowerCase().includes(query.toLowerCase()),
  );
  const colors = {
    Info: euiTheme.colors.primary,
    Warning: euiTheme.colors.warning,
    Error: euiTheme.colors.danger,
  };
  const columns = [
    { field: "time", name: "Time", width: "105px" },
    { field: "service", name: "Service", width: "105px" },
    {
      field: "message",
      name: "Event",
      render: (value, item) => (
        <span>
          {value}
          {saved.includes(item.id) ? " · Saved locally" : ""}
        </span>
      ),
    },
    {
      field: "level",
      name: "Level",
      width: "110px",
      render: (value) => <EuiHealth color={colors[value]}>{value}</EuiHealth>,
    },
    {
      name: "Action",
      width: "110px",
      render: (item) => (
        <EuiButtonEmpty
          size="xs"
          onClick={() =>
            setSaved((v) =>
              v.includes(item.id)
                ? v.filter((id) => id !== item.id)
                : [...v, item.id],
            )
          }
        >
          {saved.includes(item.id) ? "Unsave" : "Save event"}
        </EuiButtonEmpty>
      ),
    },
  ];
  return (
    <main
      style={{
        padding: 24,
        background: euiTheme.colors.backgroundBasePlain,
        color: euiTheme.colors.textParagraph,
      }}
    >
      <EuiFlexGroup justifyContent="spaceBetween" alignItems="center">
        <EuiFlexItem>
          <EuiText size="xs">
            <p>ELASTIC UI · LOG EXPLORER</p>
          </EuiText>
          <EuiTitle size="m">
            <h1>Investigate gateway events</h1>
          </EuiTitle>
        </EuiFlexItem>
        <EuiFlexItem grow={false}>
          <EuiSwitch
            label="Dark mode"
            checked={dark}
            onChange={(e) => setDark(e.target.checked)}
          />
        </EuiFlexItem>
      </EuiFlexGroup>
      <EuiSpacer size="l" />
      <EuiFlexGroup>
        <EuiFlexItem>
          <EuiPanel>
            <EuiStat title="6" description="Sample events" titleSize="m" />
          </EuiPanel>
        </EuiFlexItem>
        <EuiFlexItem>
          <EuiPanel>
            <EuiStat
              title="1"
              description="Error event"
              titleSize="m"
              titleColor="danger"
            />
          </EuiPanel>
        </EuiFlexItem>
        <EuiFlexItem>
          <EuiPanel>
            <EuiStat
              title={String(saved.length)}
              description="Saved in this preview"
              titleSize="m"
            />
          </EuiPanel>
        </EuiFlexItem>
      </EuiFlexGroup>
      <EuiSpacer size="l" />
      <EuiPanel>
        <EuiTitle size="xs">
          <h2>Event stream</h2>
        </EuiTitle>
        <EuiText size="s">
          <p>09:42:18–09:42:36 · fictional data · no live telemetry</p>
        </EuiText>
        <EuiSpacer size="m" />
        <EuiFlexGroup alignItems="center">
          <EuiFlexItem>
            <EuiFieldSearch
              fullWidth
              aria-label="Search log events"
              placeholder="Search service or message"
              value={query}
              onChange={(e) => setQuery(e.target.value)}
              incremental
            />
          </EuiFlexItem>
          <EuiFlexItem grow={false}>
            <EuiButtonGroup
              legend="Filter severity"
              options={[
                { id: "all", label: "All" },
                { id: "Warning", label: "Warning" },
                { id: "Error", label: "Error" },
              ]}
              idSelected={level}
              onChange={(id) => setLevel(id)}
            />
          </EuiFlexItem>
        </EuiFlexGroup>
        <EuiSpacer size="m" />
        <EuiText size="xs">
          <p aria-live="polite">{visible.length} matching events</p>
        </EuiText>
        <div style={{ overflowX: "auto", maxWidth: "100%" }}>
          <div style={{ minWidth: 640 }}>
            <EuiBasicTable
                  responsiveBreakpoint={false}
              items={visible}
              itemId="id"
              columns={columns}
              tableCaption="Fictional application events"
              noItemsMessage="No events match the current filters."
            />
          </div>
        </div>
        {!visible.length && (
          <EuiButtonEmpty
            onClick={() => {
              setLevel("all");
              setQuery("");
            }}
          >
            Clear filters
          </EuiButtonEmpty>
        )}
      </EuiPanel>
      <EuiSpacer size="l" />
      <EuiCallOut size="s" title="Local investigation workspace">
        Saving an event only changes this preview. No query is sent to
        Elasticsearch and no incident is created.
      </EuiCallOut>
      <EuiSpacer size="m" />
      <EuiText size="xs">
        <p>
          Native Elastic UI 123.0.0 · Borealis 8.1.0 theme · controlled filters
          and table actions.
        </p>
      </EuiText>
    </main>
  );
}
function App() {
  const [dark, setDark] = useState(false);
  return (
    <EuiProvider colorMode={dark ? "dark" : "light"}>
      <Screen dark={dark} setDark={setDark} />
    </EuiProvider>
  );
}
createRoot(document.getElementById("root")).render(<App />);

import React from 'react';
import { useEuiTheme } from '@elastic/eui';
export function InvestigationNote({ children }) {
  const { euiTheme } = useEuiTheme();
  return <aside style={{ padding: euiTheme.size.m, color: euiTheme.colors.textParagraph, borderLeft: `2px solid ${euiTheme.colors.primary}` }}>{children}</aside>;
}