Explore: Logging dedup tooltips

- use title attribute of toggle button group
- add descriptions for all dedup options

public/app/core/components/ToggleButtonGroup/ToggleButtonGroup.tsx

@@ -49,9 +49,17 @@ interface ToggleButtonProps {
   value: any;
   className?: string;
   children: ReactNode;
+  title?: string;
 }
 
-export const ToggleButton: SFC<ToggleButtonProps> = ({ children, selected, className = '', value, onChange }) => {
+export const ToggleButton: SFC<ToggleButtonProps> = ({
+  children,
+  selected,
+  className = '',
+  title = null,
+  value,
+  onChange,
+}) => {
   const handleChange = event => {
     event.stopPropagation();
     if (onChange) {
@@ -61,7 +69,7 @@ export const ToggleButton: SFC<ToggleButtonProps> = ({ children, selected, class
 
   const btnClassName = `btn ${className} ${selected ? 'active' : ''}`;
   return (
-    <button className={btnClassName} onClick={handleChange}>
+    <button className={btnClassName} onClick={handleChange} title={title}>
       <span>{children}</span>
     </button>
   );

public/app/core/logs_model.ts

@@ -88,6 +88,13 @@ export interface LogsStreamLabels {
   [key: string]: string;
 }
 
+export enum LogsDedupDescription {
+  none = 'No de-duplication',
+  exact = 'De-duplication of successive lines that are identical, ignoring ISO datetimes.',
+  numbers = 'De-duplication of successive lines that are identical when ignoring numbers, e.g., IP addresses, latencies.',
+  signature = 'De-duplication of successive lines that have identical punctuation and whitespace.',
+}
+
 export enum LogsDedupStrategy {
   none = 'none',
   exact = 'exact',

public/app/features/explore/Logs.tsx

@@ -6,6 +6,7 @@ import classnames from 'classnames';
 import * as rangeUtil from 'app/core/utils/rangeutil';
 import { RawTimeRange } from 'app/types/series';
 import {
+  LogsDedupDescription,
   LogsDedupStrategy,
   LogsModel,
   dedupLogRows,
@@ -445,6 +446,7 @@ export default class Logs extends PureComponent<LogsProps, LogsState> {
                     key={i}
                     value={dedupType}
                     onChange={onChange}
+                    title={LogsDedupDescription[dedupType] || null}
                     selected={selectedValue === dedupType}
                   >
                     {dedupType}