Add min time interval to mysql and mssql

docs/sources/administration/provisioning.md

@@ -154,7 +154,7 @@ Since not all datasources have the same configuration settings we only have the
 | tlsAuthWithCACert | boolean | *All* | Enable TLS authentication using CA cert |
 | tlsSkipVerify | boolean | *All* | Controls whether a client verifies the server's certificate chain and host name. |
 | graphiteVersion | string | Graphite |  Graphite version  |
-| timeInterval | string | Elastic, InfluxDB, PostgreSQL & Prometheus | Lowest interval/step value that should be used for this data source |
+| timeInterval | string | Elastic, InfluxDB, MSSQL, MySQL, PostgreSQL & Prometheus | Lowest interval/step value that should be used for this data source |
 | esVersion | number | Elastic | Elasticsearch version as a number (2/5/56) |
 | timeField | string | Elastic | Which field that should be used as timestamp |
 | interval | string | Elastic | Index date time format |

docs/sources/features/datasources/mssql.md

@@ -33,6 +33,22 @@ Name | Description
 *User* | Database user's login/username
 *Password* | Database user's password
 
+### Min time interval
+A lower limit for the `$__interval` variable. Recommended to be set to write frequency, for example `1m` if your data is written every minute.
+This option can also be overridden/configured in a dashboard panel under data source options. It's important to note that this value **needs** to be formatted as a
+number followed by a valid time identifier, e.g. `1m` (1 minute) or `30s` (30 seconds). The following time identifiers are supported:
+
+Identifier | Description
+------------ | -------------
+`y`   | year
+`M`   | month
+`w`   | week
+`d`   | day
+`h`   | hour
+`m`   | minute
+`s`   | second
+`ms`  | millisecond
+
 ### Database User Permissions (Important!)
 
 The database user you specify when you add the data source should only be granted SELECT permissions on

docs/sources/features/datasources/mysql.md

@@ -36,6 +36,22 @@ Name | Description
 *User* | Database user's login/username
 *Password* | Database user's password
 
+### Min time interval
+A lower limit for the `$__interval` variable. Recommended to be set to write frequency, for example `1m` if your data is written every minute.
+This option can also be overridden/configured in a dashboard panel under data source options. It's important to note that this value **needs** to be formatted as a
+number followed by a valid time identifier, e.g. `1m` (1 minute) or `30s` (30 seconds). The following time identifiers are supported:
+
+Identifier | Description
+------------ | -------------
+`y`   | year
+`M`   | month
+`w`   | week
+`d`   | day
+`h`   | hour
+`m`   | minute
+`s`   | second
+`ms`  | millisecond
+
 ### Database User Permissions (Important!)
 
 The database user you specify when you add the data source should only be granted SELECT permissions on

public/app/plugins/datasource/mssql/datasource.ts

@@ -5,12 +5,14 @@ export class MssqlDatasource {
   id: any;
   name: any;
   responseParser: ResponseParser;
+  interval: string;
 
   /** @ngInject */
   constructor(instanceSettings, private backendSrv, private $q, private templateSrv) {
     this.name = instanceSettings.name;
     this.id = instanceSettings.id;
     this.responseParser = new ResponseParser(this.$q);
+    this.interval = (instanceSettings.jsonData || {}).timeInterval;
   }
 
   interpolateVariable(value, variable) {

public/app/plugins/datasource/mssql/partials/config.html

@@ -29,6 +29,21 @@
 	</div>
 </div>
 
+<h3 class="page-heading">MSSQL details</h3>
+
+<div class="gf-form-group">
+	<div class="gf-form-inline">
+		<div class="gf-form">
+			<span class="gf-form-label width-9">Min time interval</span>
+			<input type="text" class="gf-form-input width-6" ng-model="ctrl.current.jsonData.timeInterval" spellcheck='false' placeholder="1m"></input>
+			<info-popover mode="right-absolute">
+				A lower limit for the auto group by time interval. Recommended to be set to write frequency,
+				for example <code>1m</code> if your data is written every minute.
+			</info-popover>
+		</div>
+	</div>
+</div>
+
 <div class="gf-form-group">
 	<div class="grafana-info-box">
 		<h5>User Permission</h5>

public/app/plugins/datasource/mssql/plugin.json

@@ -17,5 +17,10 @@
 
   "alerting": true,
   "annotations": true,
-  "metrics": true
+  "metrics": true,
+
+  "queryOptions": {
+    "minInterval": true
+  }
+
 }

public/app/plugins/datasource/mysql/datasource.ts

@@ -5,12 +5,14 @@ export class MysqlDatasource {
   id: any;
   name: any;
   responseParser: ResponseParser;
+  interval: string;
 
   /** @ngInject */
   constructor(instanceSettings, private backendSrv, private $q, private templateSrv) {
     this.name = instanceSettings.name;
     this.id = instanceSettings.id;
     this.responseParser = new ResponseParser(this.$q);
+    this.interval = (instanceSettings.jsonData || {}).timeInterval;
   }
 
   interpolateVariable(value, variable) {

public/app/plugins/datasource/mysql/partials/config.html

@@ -24,6 +24,21 @@
 	</div>
 </div>
 
+<h3 class="page-heading">MySQL details</h3>
+
+<div class="gf-form-group">
+	<div class="gf-form-inline">
+		<div class="gf-form">
+			<span class="gf-form-label width-9">Min time interval</span>
+			<input type="text" class="gf-form-input width-6" ng-model="ctrl.current.jsonData.timeInterval" spellcheck='false' placeholder="1m"></input>
+			<info-popover mode="right-absolute">
+				A lower limit for the auto group by time interval. Recommended to be set to write frequency,
+				for example <code>1m</code> if your data is written every minute.
+			</info-popover>
+		</div>
+	</div>
+</div>
+
 <div class="gf-form-group">
 	<div class="grafana-info-box">
 		<h5>User Permission</h5>

public/app/plugins/datasource/mysql/plugin.json

@@ -18,5 +18,10 @@
 
   "alerting": true,
   "annotations": true,
-  "metrics": true
+  "metrics": true,
+
+  "queryOptions": {
+    "minInterval": true
+  }
+
 }