diff --git a/demo/karma.yaml b/demo/karma.yaml
index 1f69348a7..2edca4575 100644
--- a/demo/karma.yaml
+++ b/demo/karma.yaml
@@ -53,7 +53,7 @@ labels:
           color: "#ff220c"
 log:
   config: false
-  level: warning
+  level: debug
 sentry:
   private: https://84a9ef37a6ed4fdb80e9ea2310d1ed26:8c6ee6f0ab02406482ff4b4e824e2c27@sentry.io/1279017
   public: https://84a9ef37a6ed4fdb80e9ea2310d1ed26@sentry.io/1279017
diff --git a/ui/src/Components/Labels/LabelWithPercent/__snapshots__/index.test.js.snap b/ui/src/Components/Labels/LabelWithPercent/__snapshots__/index.test.js.snap
new file mode 100644
index 000000000..d87242fe6
--- /dev/null
+++ b/ui/src/Components/Labels/LabelWithPercent/__snapshots__/index.test.js.snap
@@ -0,0 +1,34 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<MountedLabelWithPercent /> matches snapshot 1`] = `
+"
+<div class
+     style=\\"display: inline-block; max-width: 100%;\\"
+     data-tooltipped
+     aria-describedby=\\"tippy-tooltip-1\\"
+     data-original-title=\\"Click to only show alerts with this label or Alt+Click to hide them\\"
+>
+  <span class=\\"components-label badge badge-warning components-label-dark components-label-with-hover mb-0 pl-0 text-left\\">
+    <span class=\\"mr-1 px-1 bg-primary text-white components-labelWithPercent-percent\\">
+      25
+    </span>
+    <span class=\\"components-label-name\\">
+      foo:
+    </span>
+    <span class=\\"components-label-value\\">
+      bar
+    </span>
+  </span>
+  <div class=\\"progress silence-progress bg-white pr-1\\">
+    <div class=\\"progress-bar bg-success\\"
+         role=\\"progressbar\\"
+         style=\\"width: 50%;\\"
+         aria-valuenow=\\"50\\"
+         aria-valuemin=\\"0\\"
+         aria-valuemax=\\"100\\"
+    >
+    </div>
+  </div>
+</div>
+"
+`;
diff --git a/ui/src/Components/Labels/LabelWithPercent/index.js b/ui/src/Components/Labels/LabelWithPercent/index.js
new file mode 100644
index 000000000..c4f135e95
--- /dev/null
+++ b/ui/src/Components/Labels/LabelWithPercent/index.js
@@ -0,0 +1,69 @@
+import React from "react";
+import PropTypes from "prop-types";
+
+import { inject, observer } from "mobx-react";
+
+import { AlertStore } from "Stores/AlertStore";
+import { TooltipWrapper } from "Components/TooltipWrapper";
+import { BaseLabel } from "Components/Labels/BaseLabel";
+
+import "./index.scss";
+
+const LabelWithPercent = inject("alertStore")(
+  observer(
+    class FilteringLabel extends BaseLabel {
+      static propTypes = {
+        alertStore: PropTypes.instanceOf(AlertStore).isRequired,
+        name: PropTypes.string.isRequired,
+        value: PropTypes.string.isRequired,
+        hits: PropTypes.number.isRequired,
+        percent: PropTypes.number.isRequired
+      };
+
+      render() {
+        const { name, value, hits, percent } = this.props;
+
+        let cs = this.getClassAndStyle(
+          name,
+          value,
+          "components-label-with-hover mb-0 pl-0 text-left"
+        );
+
+        const progressBarBg =
+          percent > 66
+            ? "bg-danger"
+            : percent > 66
+            ? "bg-warning"
+            : "bg-success";
+
+        return (
+          <TooltipWrapper title="Click to only show alerts with this label or Alt+Click to hide them">
+            <span
+              className={cs.className}
+              style={cs.style}
+              onClick={e => this.handleClick(e)}
+            >
+              <span className="mr-1 px-1 bg-primary text-white components-labelWithPercent-percent">
+                {hits}
+              </span>
+              <span className="components-label-name">{name}:</span>{" "}
+              <span className="components-label-value">{value}</span>
+            </span>
+            <div className="progress silence-progress bg-white pr-1">
+              <div
+                className={`progress-bar ${progressBarBg}`}
+                role="progressbar"
+                style={{ width: percent + "%" }}
+                aria-valuenow={percent}
+                aria-valuemin="0"
+                aria-valuemax="100"
+              />
+            </div>
+          </TooltipWrapper>
+        );
+      }
+    }
+  )
+);
+
+export { LabelWithPercent };
diff --git a/ui/src/Components/Labels/LabelWithPercent/index.scss b/ui/src/Components/Labels/LabelWithPercent/index.scss
new file mode 100644
index 000000000..c6589aa4d
--- /dev/null
+++ b/ui/src/Components/Labels/LabelWithPercent/index.scss
@@ -0,0 +1,4 @@
+.components-labelWithPercent-percent {
+  padding-top: 0.25rem;
+  padding-bottom: 0.25rem;
+}
diff --git a/ui/src/Components/Labels/LabelWithPercent/index.test.js b/ui/src/Components/Labels/LabelWithPercent/index.test.js
new file mode 100644
index 000000000..8d2a8e18f
--- /dev/null
+++ b/ui/src/Components/Labels/LabelWithPercent/index.test.js
@@ -0,0 +1,63 @@
+import React from "react";
+
+import { mount } from "enzyme";
+
+import toDiffableHtml from "diffable-html";
+
+import { AlertStore, NewUnappliedFilter } from "Stores/AlertStore";
+
+import { LabelWithPercent } from ".";
+
+let alertStore;
+
+beforeEach(() => {
+  alertStore = new AlertStore([]);
+});
+
+const MountedLabelWithPercent = (name, value) => {
+  return mount(
+    <LabelWithPercent
+      alertStore={alertStore}
+      name={name}
+      value={value}
+      hits={25}
+      percent={50}
+    />
+  ).find(".components-label");
+};
+
+const RenderAndClick = (name, value, clickOptions) => {
+  const tree = MountedLabelWithPercent(name, value);
+  tree.find(".components-label").simulate("click", clickOptions || {});
+};
+
+describe("<MountedLabelWithPercent />", () => {
+  it("matches snapshot", () => {
+    const tree = mount(
+      <LabelWithPercent
+        alertStore={alertStore}
+        name="foo"
+        value="bar"
+        hits={25}
+        percent={50}
+      />
+    );
+    expect(toDiffableHtml(tree.html())).toMatchSnapshot();
+  });
+
+  it("calling onClick() adds a new filter 'foo=bar'", () => {
+    RenderAndClick("foo", "bar");
+    expect(alertStore.filters.values).toHaveLength(1);
+    expect(alertStore.filters.values).toContainEqual(
+      NewUnappliedFilter("foo=bar")
+    );
+  });
+
+  it("calling onClick() while holding Alt key adds a new filter 'foo!=bar'", () => {
+    RenderAndClick("foo", "bar", { altKey: true });
+    expect(alertStore.filters.values).toHaveLength(1);
+    expect(alertStore.filters.values).toContainEqual(
+      NewUnappliedFilter("foo!=bar")
+    );
+  });
+});
diff --git a/ui/src/Components/NavBar/index.js b/ui/src/Components/NavBar/index.js
index 5d7a05a20..d6d50daf8 100644
--- a/ui/src/Components/NavBar/index.js
+++ b/ui/src/Components/NavBar/index.js
@@ -8,13 +8,12 @@ import ReactResizeDetector from "react-resize-detector";
 
 import IdleTimer from "react-idle-timer";
 
-import Flash from "react-reveal/Flash";
-
 import { AlertStore } from "Stores/AlertStore";
 import { Settings } from "Stores/Settings";
 import { SilenceFormStore } from "Stores/SilenceFormStore";
 import { IsMobile } from "Common/Device";
 import { NavBarSlide } from "Components/Animations/NavBarSlide";
+import { OverviewModal } from "Components/OverviewModal";
 import { MainModal } from "Components/MainModal";
 import { SilenceModal } from "Components/SilenceModal";
 import { FetchIndicator } from "./FetchIndicator";
@@ -141,12 +140,8 @@ const NavBar = observer(
             >
               <nav className="navbar fixed-top navbar-expand navbar-dark p-1 bg-primary-transparent d-inline-block">
                 <ReactResizeDetector handleHeight onResize={this.onResize} />
-                <span className="navbar-brand my-0 mx-2 h1 d-none d-sm-block float-left">
-                  <Flash spy={alertStore.info.totalAlerts}>
-                    <div className="d-inline-block">
-                      {alertStore.info.totalAlerts}
-                    </div>
-                  </Flash>
+                <span className="navbar-brand p-0 my-0 mx-2 h1 d-none d-sm-block float-left">
+                  <OverviewModal alertStore={alertStore} />
                   <FetchIndicator alertStore={alertStore} />
                 </span>
                 <ul className={`navbar-nav float-right d-flex ${flexClass}`}>
diff --git a/ui/src/Components/NavBar/index.test.js b/ui/src/Components/NavBar/index.test.js
index ad11fabc4..b26970b75 100644
--- a/ui/src/Components/NavBar/index.test.js
+++ b/ui/src/Components/NavBar/index.test.js
@@ -55,7 +55,7 @@ describe("<NavBar />", () => {
   it("navbar-brand shows 15 alerts with totalAlerts=15", () => {
     alertStore.info.totalAlerts = 15;
     const tree = MountedNavbar();
-    const brand = tree.find(".navbar-brand");
+    const brand = tree.find("span.navbar-brand");
     expect(brand.text()).toBe("15");
   });
 
diff --git a/ui/src/Components/OverviewModal/OverviewModalContent.js b/ui/src/Components/OverviewModal/OverviewModalContent.js
new file mode 100644
index 000000000..e41e83a1b
--- /dev/null
+++ b/ui/src/Components/OverviewModal/OverviewModalContent.js
@@ -0,0 +1,81 @@
+import React, { Component } from "react";
+import PropTypes from "prop-types";
+
+import { observer } from "mobx-react";
+
+import { AlertStore } from "Stores/AlertStore";
+import { LabelWithPercent } from "Components/Labels/LabelWithPercent";
+
+const LabelsTable = observer(({ alertStore }) => (
+  <table
+    className="table table-borderless top-labels"
+    style={{ tableLayout: "fixed" }}
+  >
+    <tbody className="mw-100">
+      {alertStore.data.counters.map(nameStats => (
+        <tr key={nameStats.name}>
+          <td width="25%" className="text-nowrap mw-100 p-1">
+            <span className="badge badge-light components-label mx-0 my-1 pl-0 text-left">
+              <span className="bg-primary text-white mr-1 px-1 components-labelWithPercent-percent">
+                {nameStats.hits}
+              </span>
+              {nameStats.name}
+            </span>
+          </td>
+          <td width="75%" className="mw-100 p-1">
+            {nameStats.values.slice(0, 9).map(valueStats => (
+              <LabelWithPercent
+                key={valueStats.value}
+                name={nameStats.name}
+                value={valueStats.value}
+                hits={valueStats.hits}
+                percent={valueStats.percent}
+              />
+            ))}
+          </td>
+        </tr>
+      ))}
+    </tbody>
+  </table>
+));
+
+const NothingToShow = () => (
+  <div className="jumbotron bg-white">
+    <h1 className="display-5 text-secondary text-center">
+      No labels to display
+    </h1>
+  </div>
+);
+
+const OverviewModalContent = observer(
+  class OverviewModalContent extends Component {
+    static propTypes = {
+      alertStore: PropTypes.instanceOf(AlertStore).isRequired,
+      onHide: PropTypes.func.isRequired
+    };
+
+    render() {
+      const { alertStore, onHide } = this.props;
+
+      return (
+        <React.Fragment>
+          <div className="modal-header">
+            <h5 className="modal-title">Overview</h5>
+            <button type="button" className="close" onClick={onHide}>
+              <span className="align-middle">&times;</span>
+            </button>
+          </div>
+          <div className="modal-body">
+            {alertStore.data.counters.length === 0 ? (
+              <NothingToShow />
+            ) : (
+              <LabelsTable alertStore={alertStore} />
+            )}
+          </div>
+        </React.Fragment>
+      );
+    }
+  }
+);
+
+export { OverviewModalContent };
diff --git a/ui/src/Components/OverviewModal/OverviewModalContent.test.js b/ui/src/Components/OverviewModal/OverviewModalContent.test.js
new file mode 100644
index 000000000..3efa460b0
--- /dev/null
+++ b/ui/src/Components/OverviewModal/OverviewModalContent.test.js
@@ -0,0 +1,66 @@
+import React from "react";
+
+import { Provider } from "mobx-react";
+
+import { mount } from "enzyme";
+
+import toDiffableHtml from "diffable-html";
+
+import { AlertStore } from "Stores/AlertStore";
+import { OverviewModalContent } from "./OverviewModalContent";
+
+let alertStore;
+const onHide = jest.fn();
+
+beforeEach(() => {
+  alertStore = new AlertStore([]);
+  onHide.mockClear();
+});
+
+afterEach(() => {
+  jest.restoreAllMocks();
+});
+
+describe("<OverviewModalContent />", () => {
+  it("matches snapshot with labels to show", () => {
+    alertStore.data.counters = [
+      {
+        name: "foo",
+        hits: 16,
+        values: [
+          { value: "bar1", hits: 8, percent: 50 },
+          { value: "bar2", hits: 4, percent: 25 },
+          { value: "bar3", hits: 4, percent: 25 }
+        ]
+      }
+    ];
+
+    // we have multiple fragments and enzyme only renders the first one
+    // in html() and text(), debug() would work but it's noisy
+    // https://github.com/airbnb/enzyme/issues/1213
+    const tree = mount(
+      <span>
+        <Provider alertStore={alertStore}>
+          <OverviewModalContent alertStore={alertStore} onHide={onHide} />
+        </Provider>
+      </span>
+    );
+    expect(toDiffableHtml(tree.html())).toMatchSnapshot();
+  });
+
+  it("matches snapshot with no labels to show", () => {
+    alertStore.data.counters = [];
+
+    // we have multiple fragments and enzyme only renders the first one
+    // in html() and text(), debug() would work but it's noisy
+    // https://github.com/airbnb/enzyme/issues/1213
+    const tree = mount(
+      <span>
+        <Provider alertStore={alertStore}>
+          <OverviewModalContent alertStore={alertStore} onHide={onHide} />
+        </Provider>
+      </span>
+    );
+    expect(toDiffableHtml(tree.html())).toMatchSnapshot();
+  });
+});
diff --git a/ui/src/Components/OverviewModal/__snapshots__/OverviewModalContent.test.js.snap b/ui/src/Components/OverviewModal/__snapshots__/OverviewModalContent.test.js.snap
new file mode 100644
index 000000000..c1647fe93
--- /dev/null
+++ b/ui/src/Components/OverviewModal/__snapshots__/OverviewModalContent.test.js.snap
@@ -0,0 +1,154 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`<OverviewModalContent /> matches snapshot with labels to show 1`] = `
+"
+<span>
+  <div class=\\"modal-header\\">
+    <h5 class=\\"modal-title\\">
+      Overview
+    </h5>
+    <button type=\\"button\\"
+            class=\\"close\\"
+    >
+      <span class=\\"align-middle\\">
+        ×
+      </span>
+    </button>
+  </div>
+  <div class=\\"modal-body\\">
+    <table class=\\"table table-borderless top-labels\\"
+           style=\\"table-layout: fixed;\\"
+    >
+      <tbody class=\\"mw-100\\">
+        <tr>
+          <td width=\\"25%\\"
+              class=\\"text-nowrap mw-100 p-1\\"
+          >
+            <span class=\\"badge badge-light components-label mx-0 my-1 pl-0 text-left\\">
+              <span class=\\"bg-primary text-white mr-1 px-1 components-labelWithPercent-percent\\">
+                16
+              </span>
+              foo
+            </span>
+          </td>
+          <td width=\\"75%\\"
+              class=\\"mw-100 p-1\\"
+          >
+            <div class
+                 style=\\"display: inline-block; max-width: 100%;\\"
+                 data-tooltipped
+                 aria-describedby=\\"tippy-tooltip-1\\"
+                 data-original-title=\\"Click to only show alerts with this label or Alt+Click to hide them\\"
+            >
+              <span class=\\"components-label badge badge-warning components-label-dark components-label-with-hover mb-0 pl-0 text-left\\">
+                <span class=\\"mr-1 px-1 bg-primary text-white components-labelWithPercent-percent\\">
+                  8
+                </span>
+                <span class=\\"components-label-name\\">
+                  foo:
+                </span>
+                <span class=\\"components-label-value\\">
+                  bar1
+                </span>
+              </span>
+              <div class=\\"progress silence-progress bg-white pr-1\\">
+                <div class=\\"progress-bar bg-success\\"
+                     role=\\"progressbar\\"
+                     style=\\"width: 50%;\\"
+                     aria-valuenow=\\"50\\"
+                     aria-valuemin=\\"0\\"
+                     aria-valuemax=\\"100\\"
+                >
+                </div>
+              </div>
+            </div>
+            <div class
+                 style=\\"display: inline-block; max-width: 100%;\\"
+                 data-tooltipped
+                 aria-describedby=\\"tippy-tooltip-2\\"
+                 data-original-title=\\"Click to only show alerts with this label or Alt+Click to hide them\\"
+            >
+              <span class=\\"components-label badge badge-warning components-label-dark components-label-with-hover mb-0 pl-0 text-left\\">
+                <span class=\\"mr-1 px-1 bg-primary text-white components-labelWithPercent-percent\\">
+                  4
+                </span>
+                <span class=\\"components-label-name\\">
+                  foo:
+                </span>
+                <span class=\\"components-label-value\\">
+                  bar2
+                </span>
+              </span>
+              <div class=\\"progress silence-progress bg-white pr-1\\">
+                <div class=\\"progress-bar bg-success\\"
+                     role=\\"progressbar\\"
+                     style=\\"width: 25%;\\"
+                     aria-valuenow=\\"25\\"
+                     aria-valuemin=\\"0\\"
+                     aria-valuemax=\\"100\\"
+                >
+                </div>
+              </div>
+            </div>
+            <div class
+                 style=\\"display: inline-block; max-width: 100%;\\"
+                 data-tooltipped
+                 aria-describedby=\\"tippy-tooltip-3\\"
+                 data-original-title=\\"Click to only show alerts with this label or Alt+Click to hide them\\"
+            >
+              <span class=\\"components-label badge badge-warning components-label-dark components-label-with-hover mb-0 pl-0 text-left\\">
+                <span class=\\"mr-1 px-1 bg-primary text-white components-labelWithPercent-percent\\">
+                  4
+                </span>
+                <span class=\\"components-label-name\\">
+                  foo:
+                </span>
+                <span class=\\"components-label-value\\">
+                  bar3
+                </span>
+              </span>
+              <div class=\\"progress silence-progress bg-white pr-1\\">
+                <div class=\\"progress-bar bg-success\\"
+                     role=\\"progressbar\\"
+                     style=\\"width: 25%;\\"
+                     aria-valuenow=\\"25\\"
+                     aria-valuemin=\\"0\\"
+                     aria-valuemax=\\"100\\"
+                >
+                </div>
+              </div>
+            </div>
+          </td>
+        </tr>
+      </tbody>
+    </table>
+  </div>
+</span>
+"
+`;
+
+exports[`<OverviewModalContent /> matches snapshot with no labels to show 1`] = `
+"
+<span>
+  <div class=\\"modal-header\\">
+    <h5 class=\\"modal-title\\">
+      Overview
+    </h5>
+    <button type=\\"button\\"
+            class=\\"close\\"
+    >
+      <span class=\\"align-middle\\">
+        ×
+      </span>
+    </button>
+  </div>
+  <div class=\\"modal-body\\">
+    <div class=\\"jumbotron bg-white\\">
+      <h1 class=\\"display-5 text-secondary text-center\\">
+        No labels to display
+      </h1>
+    </div>
+  </div>
+</span>
+"
+`;
diff --git a/ui/src/Components/OverviewModal/index.js b/ui/src/Components/OverviewModal/index.js
new file mode 100644
index 000000000..e41adae5e
--- /dev/null
+++ b/ui/src/Components/OverviewModal/index.js
@@ -0,0 +1,84 @@
+import React, { Component } from "react";
+import PropTypes from "prop-types";
+
+import { observer, Provider } from "mobx-react";
+import { observable, action } from "mobx";
+
+import Flash from "react-reveal/Flash";
+
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import { faSpinner } from "@fortawesome/free-solid-svg-icons/faSpinner";
+
+import { AlertStore } from "Stores/AlertStore";
+import { TooltipWrapper } from "Components/TooltipWrapper";
+import { Modal } from "Components/Modal";
+
+import "./index.scss";
+
+// https://github.com/facebook/react/issues/14603
+const OverviewModalContent = React.lazy(() =>
+  import("./OverviewModalContent").then(module => ({
+    default: module.OverviewModalContent
+  }))
+);
+
+const OverviewModal = observer(
+  class OverviewModal extends Component {
+    static propTypes = {
+      alertStore: PropTypes.instanceOf(AlertStore).isRequired
+    };
+
+    toggle = observable(
+      {
+        show: false,
+        toggle() {
+          this.show = !this.show;
+        },
+        hide() {
+          this.show = false;
+        }
+      },
+      { toggle: action.bound, hide: action.bound }
+    );
+
+    render() {
+      const { alertStore } = this.props;
+
+      return (
+        <React.Fragment>
+          <TooltipWrapper title="Show alert overview">
+            <Flash spy={alertStore.info.totalAlerts}>
+              <div
+                className={`text-center d-inline-block cursor-pointer navbar-brand m-0 ${
+                  this.toggle.show ? "border-bottom border-info" : ""
+                }`}
+                onClick={this.toggle.toggle}
+              >
+                {alertStore.info.totalAlerts}
+              </div>
+            </Flash>
+          </TooltipWrapper>
+          <Modal isOpen={this.toggle.show}>
+            <React.Suspense
+              fallback={
+                <h1 className="display-1 text-secondary p-5 m-auto">
+                  <FontAwesomeIcon icon={faSpinner} size="lg" spin />
+                </h1>
+              }
+            >
+              <Provider alertStore={alertStore}>
+                <OverviewModalContent
+                  alertStore={alertStore}
+                  onHide={this.toggle.hide}
+                  isVisible={this.toggle.show}
+                />
+              </Provider>
+            </React.Suspense>
+          </Modal>
+        </React.Fragment>
+      );
+    }
+  }
+);
+
+export { OverviewModal };
diff --git a/ui/src/Components/OverviewModal/index.scss b/ui/src/Components/OverviewModal/index.scss
new file mode 100644
index 000000000..4816362e4
--- /dev/null
+++ b/ui/src/Components/OverviewModal/index.scss
@@ -0,0 +1,10 @@
+@import "~bootswatch/dist/flatly/variables";
+@import "~bootstrap/scss/bootstrap";
+@import "~bootswatch/dist/flatly/bootswatch";
+
+.navbar-brand {
+  &:hover,
+  &:focus {
+    color: $green !important;
+  }
+}
diff --git a/ui/src/Components/OverviewModal/index.test.js b/ui/src/Components/OverviewModal/index.test.js
new file mode 100644
index 000000000..191fa95c8
--- /dev/null
+++ b/ui/src/Components/OverviewModal/index.test.js
@@ -0,0 +1,96 @@
+import React from "react";
+
+import { mount } from "enzyme";
+
+import { AlertStore } from "Stores/AlertStore";
+import { OverviewModal } from ".";
+
+let alertStore;
+
+beforeAll(() => {
+  jest.useFakeTimers();
+});
+
+beforeEach(() => {
+  alertStore = new AlertStore([]);
+});
+
+const MountedOverviewModal = () => {
+  return mount(<OverviewModal alertStore={alertStore} />);
+};
+
+describe("<OverviewModal />", () => {
+  it("only renders the counter when modal is not shown", () => {
+    const tree = MountedOverviewModal();
+    expect(tree.text()).toBe("0");
+    expect(tree.find("OverviewModalContent")).toHaveLength(0);
+  });
+
+  it("renders a spinner placeholder while modal content is loading", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+    toggle.simulate("click");
+    expect(tree.find("OverviewModalContent")).toHaveLength(0);
+    expect(tree.find(".modal-content").find("svg.fa-spinner")).toHaveLength(1);
+  });
+
+  it("renders modal content if fallback is not used", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+    toggle.simulate("click");
+    expect(tree.find("OverviewModalContent")).toHaveLength(1);
+    expect(tree.find(".modal-content").find("svg.fa-spinner")).toHaveLength(0);
+  });
+
+  it("hides the modal when toggle() is called twice", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+
+    toggle.simulate("click");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("OverviewModalContent")).toHaveLength(1);
+
+    toggle.simulate("click");
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("OverviewModalContent")).toHaveLength(0);
+  });
+
+  it("hides the modal when hide() is called", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+
+    toggle.simulate("click");
+    expect(tree.find("OverviewModalContent")).toHaveLength(1);
+
+    const instance = tree.instance();
+    instance.toggle.hide();
+    jest.runOnlyPendingTimers();
+    tree.update();
+    expect(tree.find("OverviewModalContent")).toHaveLength(0);
+  });
+
+  it("'modal-open' class is appended to body node when modal is visible", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+    toggle.simulate("click");
+    expect(document.body.className.split(" ")).toContain("modal-open");
+  });
+
+  it("'modal-open' class is removed from body node after modal is hidden", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+    toggle.simulate("click");
+    toggle.simulate("click");
+    expect(document.body.className.split(" ")).not.toContain("modal-open");
+  });
+
+  it("'modal-open' class is removed from body node after modal is unmounted", () => {
+    const tree = MountedOverviewModal();
+    const toggle = tree.find("div.navbar-brand");
+    toggle.simulate("click");
+    tree.unmount();
+    expect(document.body.className.split(" ")).not.toContain("modal-open");
+  });
+});
diff --git a/ui/src/Stores/AlertStore.js b/ui/src/Stores/AlertStore.js
index 99a5d38ba..b7df92ead 100644
--- a/ui/src/Stores/AlertStore.js
+++ b/ui/src/Stores/AlertStore.js
@@ -137,7 +137,7 @@ class AlertStore {
   data = observable(
     {
       colors: {},
-      counters: {},
+      counters: [],
       groups: {},
       silences: {},
       upstreams: { instances: [], clusters: {} },