dispatch: Add group_by_all support (#1588)

To aggregate by all possible labels use '...' as the sole label name. 
This effectively disables aggregation entirely, passing through all 
alerts as-is. This is unlikely to be what you want, unless you have 
a very low alert volume or your upstream notification system performs 
its own grouping. Example: group_by: [...]

Signed-off-by: Kyryl Sablin <kyryl.sablin@schibsted.com>

README.md

@@ -70,6 +70,12 @@ route:
   # The labels by which incoming alerts are grouped together. For example,
   # multiple alerts coming in for cluster=A and alertname=LatencyHigh would
   # be batched into a single group.
+  #
+  # To aggregate by all possible labels use '...' as the sole label name. 
+  # This effectively disables aggregation entirely, passing through all 
+  # alerts as-is. This is unlikely to be what you want, unless you have 
+  # a very low alert volume or your upstream notification system performs 
+  # its own grouping. Example: group_by: [...]
   group_by: ['alertname', 'cluster']
 
   # When a new group of alerts is created by an incoming alert, wait at

config/config.go

@@ -495,7 +495,10 @@ func (c *GlobalConfig) UnmarshalYAML(unmarshal func(interface{}) error) error {
 // A Route is a node that contains definitions of how to handle alerts.
 type Route struct {
 	Receiver string `yaml:"receiver,omitempty" json:"receiver,omitempty"`
-	GroupBy  []model.LabelName `yaml:"group_by,omitempty" json:"group_by,omitempty"`
+
+	GroupByStr []string `yaml:"group_by,omitempty" json:"group_by,omitempty"`
+	GroupBy    []model.LabelName
+	GroupByAll bool
 
 	Match    map[string]string `yaml:"match,omitempty" json:"match,omitempty"`
 	MatchRE  map[string]Regexp `yaml:"match_re,omitempty" json:"match_re,omitempty"`
@@ -525,6 +528,21 @@ func (r *Route) UnmarshalYAML(unmarshal func(interface{}) error) error {
 			return fmt.Errorf("invalid label name %q", k)
 		}
 	}
+	for _, l := range r.GroupByStr {
+		if l == "..." {
+			r.GroupByAll = true
+		} else {
+			labelName := model.LabelName(l)
+			if !labelName.IsValid() {
+				return fmt.Errorf("invalid label name %q in group_by list", l)
+			}
+			r.GroupBy = append(r.GroupBy, labelName)
+		}
+	}
+
+	if len(r.GroupBy) > 0 && r.GroupByAll {
+		return fmt.Errorf("cannot have wildcard group_by (`...`) and other other labels at the same time")
+	}
 
 	groupBy := map[model.LabelName]struct{}{}
 

config/config_test.go

@@ -144,6 +144,47 @@ receivers:
 
 }
 
+func TestWildcardGroupByWithOtherGroupByLabels(t *testing.T) {
+	in := `
+route:
+  group_by: ['alertname', 'cluster', '...']
+  receiver: team-X-mails
+receivers:
+- name: 'team-X-mails'
+`
+	_, err := Load(in)
+
+	expected := "cannot have wildcard group_by (`...`) and other other labels at the same time"
+
+	if err == nil {
+		t.Fatalf("no error returned, expected:\n%q", expected)
+	}
+	if err.Error() != expected {
+		t.Errorf("\nexpected:\n%q\ngot:\n%q", expected, err.Error())
+	}
+}
+
+func TestGroupByInvalidLabel(t *testing.T) {
+	in := `
+route:
+  group_by: ['-invalid-']
+  receiver: team-X-mails
+receivers:
+- name: 'team-X-mails'
+`
+	_, err := Load(in)
+
+	expected := "invalid label name \"-invalid-\" in group_by list"
+
+	if err == nil {
+		t.Fatalf("no error returned, expected:\n%q", expected)
+	}
+	if err.Error() != expected {
+		t.Errorf("\nexpected:\n%q\ngot:\n%q", expected, err.Error())
+	}
+
+}
+
 func TestRootRouteExists(t *testing.T) {
 	in := `
 receivers:
@@ -448,6 +489,12 @@ func TestEmptyFieldsAndRegex(t *testing.T) {
 				"cluster",
 				"service",
 			},
+			GroupByStr: []string{
+				"alertname",
+				"cluster",
+				"service",
+			},
+			GroupByAll: false,
 			Routes: []*Route{
 				{
 					Receiver: "team-X-mails",
@@ -506,6 +553,17 @@ func TestSMTPHello(t *testing.T) {
 	}
 }
 
+func TestGroupByAll(t *testing.T) {
+	c, _, err := LoadFile("testdata/conf.group-by-all.yml")
+	if err != nil {
+		t.Errorf("Error parsing %s: %s", "testdata/conf.group-by-all.yml", err)
+	}
+
+	if !c.Route.GroupByAll {
+		t.Errorf("Invalid group by all param: expected to by true")
+	}
+}
+
 func TestVictorOpsDefaultAPIKey(t *testing.T) {
 	conf, _, err := LoadFile("testdata/conf.victorops-default-apikey.yml")
 	if err != nil {

config/testdata/conf.group-by-all.yml

@@ -0,0 +1,10 @@
+route:
+  group_by: [...]
+  group_wait: 30s
+  group_interval: 5m
+  repeat_interval: 3h
+  receiver: team-X
+
+receivers:
+- name: 'team-X'
+

dispatch/dispatch.go

@@ -152,13 +152,7 @@ type notifyFunc func(context.Context, ...*types.Alert) bool
 // processAlert determines in which aggregation group the alert falls
 // and inserts it.
 func (d *Dispatcher) processAlert(alert *types.Alert, route *Route) {
-	groupLabels := model.LabelSet{}
-
-	for ln, lv := range alert.Labels {
-		if _, ok := route.RouteOpts.GroupBy[ln]; ok {
-			groupLabels[ln] = lv
-		}
-	}
+	groupLabels := getGroupLabels(alert, route)
 
 	fp := groupLabels.Fingerprint()
 
@@ -189,6 +183,17 @@ func (d *Dispatcher) processAlert(alert *types.Alert, route *Route) {
 	ag.insert(alert)
 }
 
+func getGroupLabels(alert *types.Alert, route *Route) model.LabelSet {
+	groupLabels := model.LabelSet{}
+	for ln, lv := range alert.Labels {
+		if _, ok := route.RouteOpts.GroupBy[ln]; ok || route.RouteOpts.GroupByAll {
+			groupLabels[ln] = lv
+		}
+	}
+
+	return groupLabels
+}
+
 // aggrGroup aggregates alert fingerprints into groups to which a
 // common set of routing options applies.
 // It emits notifications in the specified intervals.

dispatch/dispatch_test.go

@@ -240,3 +240,67 @@ func TestAggrGroup(t *testing.T) {
 
 	ag.stop()
 }
+
+func TestGroupLabels(t *testing.T) {
+	var a = &types.Alert{
+		Alert: model.Alert{
+			Labels: model.LabelSet{
+				"a": "v1",
+				"b": "v2",
+				"c": "v3",
+			},
+		},
+	}
+
+	route := &Route{
+		RouteOpts: RouteOpts{
+			GroupBy: map[model.LabelName]struct{}{
+				"a": struct{}{},
+				"b": struct{}{},
+			},
+			GroupByAll: false,
+		},
+	}
+
+	expLs := model.LabelSet{
+		"a": "v1",
+		"b": "v2",
+	}
+
+	ls := getGroupLabels(a, route)
+
+	if !reflect.DeepEqual(ls, expLs) {
+		t.Fatalf("expected labels are %v, but got %v", expLs, ls)
+	}
+}
+
+func TestGroupByAllLabels(t *testing.T) {
+	var a = &types.Alert{
+		Alert: model.Alert{
+			Labels: model.LabelSet{
+				"a": "v1",
+				"b": "v2",
+				"c": "v3",
+			},
+		},
+	}
+
+	route := &Route{
+		RouteOpts: RouteOpts{
+			GroupBy:    map[model.LabelName]struct{}{},
+			GroupByAll: true,
+		},
+	}
+
+	expLs := model.LabelSet{
+		"a": "v1",
+		"b": "v2",
+		"c": "v3",
+	}
+
+	ls := getGroupLabels(a, route)
+
+	if !reflect.DeepEqual(ls, expLs) {
+		t.Fatalf("expected labels are %v, but got %v", expLs, ls)
+	}
+}

dispatch/route.go

@@ -32,6 +32,7 @@ var DefaultRouteOpts = RouteOpts{
 	GroupInterval:  5 * time.Minute,
 	RepeatInterval: 4 * time.Hour,
 	GroupBy:        map[model.LabelName]struct{}{},
+	GroupByAll:     false,
 }
 
 // A Route is a node that contains definitions of how to handle alerts.
@@ -69,6 +70,9 @@ func NewRoute(cr *config.Route, parent *Route) *Route {
 			opts.GroupBy[ln] = struct{}{}
 		}
 	}
+
+	opts.GroupByAll = cr.GroupByAll
+
 	if cr.GroupWait != nil {
 		opts.GroupWait = time.Duration(*cr.GroupWait)
 	}
@@ -158,6 +162,9 @@ type RouteOpts struct {
 	// What labels to group alerts by for notifications.
 	GroupBy map[model.LabelName]struct{}
 
+	// Use all alert labels to group.
+	GroupByAll bool
+
 	// How long to wait to group matching alerts before sending
 	// a notification.
 	GroupWait      time.Duration
@@ -170,7 +177,8 @@ func (ro *RouteOpts) String() string {
 	for ln := range ro.GroupBy {
 		labels = append(labels, ln)
 	}
-	return fmt.Sprintf("<RouteOpts send_to:%q group_by:%q timers:%q|%q>", ro.Receiver, labels, ro.GroupWait, ro.GroupInterval)
+	return fmt.Sprintf("<RouteOpts send_to:%q group_by:%q group_by_all:%t timers:%q|%q>",
+		ro.Receiver, labels, ro.GroupByAll, ro.GroupWait, ro.GroupInterval)
 }
 
 // MarshalJSON returns a JSON representation of the routing options.
@@ -178,11 +186,13 @@ func (ro *RouteOpts) MarshalJSON() ([]byte, error) {
 	v := struct {
 		Receiver       string           `json:"receiver"`
 		GroupBy        model.LabelNames `json:"groupBy"`
+		GroupByAll     bool             `json:"groupByAll"`
 		GroupWait      time.Duration    `json:"groupWait"`
 		GroupInterval  time.Duration    `json:"groupInterval"`
 		RepeatInterval time.Duration    `json:"repeatInterval"`
 	}{
 		Receiver:       ro.Receiver,
+		GroupByAll:     ro.GroupByAll,
 		GroupWait:      ro.GroupWait,
 		GroupInterval:  ro.GroupInterval,
 		RepeatInterval: ro.RepeatInterval,

dispatch/route_test.go

@@ -39,7 +39,7 @@ routes:
       env: 'testing'
 
     receiver: 'notify-testing'
-    group_by: []
+    group_by: [...]
 
   - match:
       env: "production"
@@ -110,6 +110,7 @@ routes:
 				{
 					Receiver:       "notify-A",
 					GroupBy:        def.GroupBy,
+					GroupByAll:     false,
 					GroupWait:      def.GroupWait,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -126,6 +127,7 @@ routes:
 				{
 					Receiver:       "notify-A",
 					GroupBy:        def.GroupBy,
+					GroupByAll:     false,
 					GroupWait:      def.GroupWait,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -141,6 +143,7 @@ routes:
 				{
 					Receiver:       "notify-BC",
 					GroupBy:        lset("foo", "bar"),
+					GroupByAll:     false,
 					GroupWait:      2 * time.Minute,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -157,6 +160,7 @@ routes:
 				{
 					Receiver:       "notify-testing",
 					GroupBy:        lset(),
+					GroupByAll:     true,
 					GroupWait:      def.GroupWait,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -173,6 +177,7 @@ routes:
 				{
 					Receiver:       "notify-productionA",
 					GroupBy:        def.GroupBy,
+					GroupByAll:     false,
 					GroupWait:      1 * time.Minute,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -180,6 +185,7 @@ routes:
 				{
 					Receiver:       "notify-productionB",
 					GroupBy:        lset("job"),
+					GroupByAll:     false,
 					GroupWait:      30 * time.Second,
 					GroupInterval:  5 * time.Minute,
 					RepeatInterval: 1 * time.Hour,
@@ -198,6 +204,7 @@ routes:
 				{
 					Receiver:       "notify-def",
 					GroupBy:        lset("role"),
+					GroupByAll:     false,
 					GroupWait:      def.GroupWait,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -214,6 +221,7 @@ routes:
 				{
 					Receiver:       "notify-testing",
 					GroupBy:        lset("role"),
+					GroupByAll:     false,
 					GroupWait:      def.GroupWait,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,
@@ -231,6 +239,7 @@ routes:
 				{
 					Receiver:       "notify-testing",
 					GroupBy:        lset("role"),
+					GroupByAll:     false,
 					GroupWait:      2 * time.Minute,
 					GroupInterval:  def.GroupInterval,
 					RepeatInterval: def.RepeatInterval,

doc/examples/simple.yml

@@ -18,6 +18,12 @@ route:
   # The labels by which incoming alerts are grouped together. For example,
   # multiple alerts coming in for cluster=A and alertname=LatencyHigh would
   # be batched into a single group.
+  #
+  # To aggregate by all possible labels use '...' as the sole label name.
+  # This effectively disables aggregation entirely, passing through all
+  # alerts as-is. This is unlikely to be what you want, unless you have
+  # a very low alert volume or your upstream notification system performs
+  # its own grouping. Example: group_by: [...]
   group_by: ['alertname', 'cluster', 'service']
 
   # When a new group of alerts is created by an incoming alert, wait at