api: add post_updates_to_thread to VMAlertmanagerConfig Slack receiver

api/operator/v1beta1/vmalertmanagerconfig_types.go

@@ -900,6 +900,14 @@ type SlackConfig struct {
 	// Available since alertmanager v0.32.0.
 	// +optional
 	UpdateMessage *bool `json:"update_message,omitempty" yaml:"update_message,omitempty"`
+	// Whether to post subsequent notifications for an alert group as replies
+	// in the thread of the initial message, instead of new channel messages.
+	// Can be combined with update_message to update the initial message in-place
+	// and also post a reply to its thread.
+	// Requires Slack Bot API and chat:write scope.
+	// Available since alertmanager v0.35.0.
+	// +optional
+	PostUpdatesToThread *bool `json:"post_updates_to_thread,omitempty" yaml:"post_updates_to_thread,omitempty"`
 	// HTTP client configuration.
 	// +optional
 	HTTPConfig *HTTPConfig `json:"http_config,omitempty" yaml:"http_config,omitempty"`

docs/CHANGELOG.md

@@ -13,6 +13,8 @@ aliases:
 
 ## tip
 
+* FEATURE: [vmalertmanagerconfig](https://docs.victoriametrics.com/operator/resources/vmalertmanagerconfig/): add `post_updates_to_thread` field to `SlackConfig`. This allows alertmanager to post subsequent notifications for an alert group as replies in the thread of the initial Slack message; combined with `update_message`, the initial message is updated in-place and a reply is also posted to its thread. Requires alertmanager with [prometheus/alertmanager#5540](https://github.com/prometheus/alertmanager/pull/5540) (targeting v0.35.0). See [#2580](https://github.com/VictoriaMetrics/operator/pull/2580).
+
 * Dependency: [vmoperator](https://docs.victoriametrics.com/operator/): Updated default versions for VM apps to [v1.151.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.151.0) version
 * Dependency: [vmoperator](https://docs.victoriametrics.com/operator/): Updated default versions for VMAnomaly to [v1.30.4](https://docs.victoriametrics.com/anomaly-detection/changelog/#v1304) version
 * Dependency: [vmoperator](https://docs.victoriametrics.com/operator/): Updated default versions for VT apps to [v0.11.0](https://github.com/VictoriaMetrics/VictoriaTraces/releases/tag/v0.11.0) version

internal/controller/operator/factory/vmalertmanager/config.go

@@ -972,6 +972,9 @@ func buildSlack(gc *globalConfig, rc vmv1beta1.SlackConfig, ns string, ac *build
 	if rc.UpdateMessage != nil {
 		r.set("update_message", rc.UpdateMessage)
 	}
+	if rc.PostUpdatesToThread != nil {
+		r.set("post_updates_to_thread", rc.PostUpdatesToThread)
+	}
 	r.set("mrkdwn_in", rc.MrkdwnIn)
 	var actions []yaml.MapSlice
 	for _, action := range rc.Actions {

internal/controller/operator/factory/vmalertmanager/config_test.go

@@ -759,14 +759,15 @@ templates: []
 											Name: "slack",
 										},
 									},
-									SendResolved:  ptr.To(true),
-									UpdateMessage: ptr.To(true),
-									Text:          "some-text",
-									Title:         "some-title",
-									LinkNames:     false,
-									ThumbURL:      "some-url",
-									Pretext:       "text-1",
-									Username:      "some-user",
+									SendResolved:        ptr.To(true),
+									UpdateMessage:       ptr.To(true),
+									PostUpdatesToThread: ptr.To(true),
+									Text:                "some-text",
+									Title:               "some-title",
+									LinkNames:           false,
+									ThumbURL:            "some-url",
+									Pretext:             "text-1",
+									Username:            "some-user",
 									Actions: []vmv1beta1.SlackAction{
 										{
 											Name: "deny",
@@ -827,6 +828,7 @@ receivers:
     title: some-title
     thumb_url: some-url
     update_message: true
+    post_updates_to_thread: true
     actions:
     - name: deny
       text: text-5