Datasource/Cloudwatch: Adds support for Cloudwatch Logs (#23566)

* Datasource/Cloudwatch: Adds support for Cloudwatch Logs

* Fix rebase leftover

* Use jsurl for AWS url serialization

* WIP: Temporary workaround for CLIQ metrics

* Only allow up to 20 log groups to be selected

* WIP additional changes

* More changes based on feedback

* More changes based on PR feedback

* Fix strict null errors

pkg/services/alerting/conditions/query.go

@@ -52,7 +52,7 @@ func (c *QueryCondition) Eval(context *alerting.EvalContext) (*alerting.Conditio
 		return nil, err
 	}
 
-	emptySerieCount := 0
+	emptySeriesCount := 0
 	evalMatchCount := 0
 	var matches []*alerting.EvalMatch
 
@@ -61,7 +61,7 @@ func (c *QueryCondition) Eval(context *alerting.EvalContext) (*alerting.Conditio
 		evalMatch := c.Evaluator.Eval(reducedValue)
 
 		if !reducedValue.Valid {
-			emptySerieCount++
+			emptySeriesCount++
 		}
 
 		if context.IsTestRun {
@@ -100,7 +100,7 @@ func (c *QueryCondition) Eval(context *alerting.EvalContext) (*alerting.Conditio
 
 	return &alerting.ConditionResult{
 		Firing:      evalMatchCount > 0,
-		NoDataFound: emptySerieCount == len(seriesList),
+		NoDataFound: emptySeriesCount == len(seriesList),
 		Operator:    c.Operator,
 		EvalMatches: matches,
 	}, nil
@@ -224,6 +224,9 @@ func (c *QueryCondition) getRequestForAlertRule(datasource *models.DataSource, t
 				DataSource: datasource,
 			},
 		},
+		Headers: map[string]string{
+			"FromAlert": "true",
+		},
 		Debug: debug,
 	}