Alerting: added possibility to preview grafana managed alert rules. (#34600) (#34704)

* starting to add eval logic.

* wip

* first version of test rule.

* reverted file.

* add info colum to result to show error or (with CC evalmatches)

* fix labels in evalmatch

* fix be test

* refactored using observables.

* moved widht/height div to outside panel rendere.

* adding docs api level.

* adding container styles to error div.

* increasing size of preview.

Co-authored-by: kyle <kyle@grafana.com>
(cherry picked from commit e19b3df1a9)

Co-authored-by: Marcus Andersson <marcus.andersson@grafana.com>

pkg/expr/classic/classic_test.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"testing"
 
+	"github.com/grafana/grafana-plugin-sdk-go/data"
 	"github.com/grafana/grafana/pkg/expr/mathexp"
 	"github.com/stretchr/testify/require"
 	ptr "github.com/xorcare/pointer"
@@ -202,7 +203,7 @@ func TestConditionsCmdExecute(t *testing.T) {
 			vars: mathexp.Vars{
 				"A": mathexp.Results{
 					Values: []mathexp.Value{
-						valBasedSeries(ptr.Float64(30), ptr.Float64(40)),
+						valBasedSeriesWithLabels(data.Labels{"h": "1"}, ptr.Float64(30), ptr.Float64(40)),
 						valBasedSeries(ptr.Float64(0), ptr.Float64(10)),
 					},
 				},
@@ -218,7 +219,7 @@ func TestConditionsCmdExecute(t *testing.T) {
 				}},
 			resultNumber: func() mathexp.Number {
 				v := valBasedNumber(ptr.Float64(1))
-				v.SetMeta([]EvalMatch{{Value: ptr.Float64(35)}})
+				v.SetMeta([]EvalMatch{{Value: ptr.Float64(35), Labels: data.Labels{"h": "1"}}})
 				return v
 			},
 		},

pkg/expr/classic/reduce.go

@@ -24,6 +24,11 @@ func (cr classicReducer) ValidReduceFunc() bool {
 //nolint: gocyclo
 func (cr classicReducer) Reduce(series mathexp.Series) mathexp.Number {
 	num := mathexp.NewNumber("", nil)
+
+	if series.GetLabels() != nil {
+		num.SetLabels(series.GetLabels().Copy())
+	}
+
 	num.SetValue(nil)
 
 	if series.Len() == 0 {

pkg/expr/classic/reduce_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/grafana/grafana-plugin-sdk-go/data"
 	"github.com/grafana/grafana/pkg/expr/mathexp"
 	"github.com/stretchr/testify/require"
 	ptr "github.com/xorcare/pointer"
@@ -408,6 +409,17 @@ func valBasedSeries(vals ...*float64) mathexp.Series {
 	return newSeries
 }
 
+func valBasedSeriesWithLabels(l data.Labels, vals ...*float64) mathexp.Series {
+	newSeries := mathexp.NewSeries("", l, 0, false, 1, true, len(vals))
+	for idx, f := range vals {
+		err := newSeries.SetPoint(idx, unixTimePointer(int64(idx)), f)
+		if err != nil {
+			panic(err)
+		}
+	}
+	return newSeries
+}
+
 func unixTimePointer(sec int64) *time.Time {
 	t := time.Unix(sec, 0)
 	return &t