Add metric warning support (announcement bar and DM) (#14483)

* Admin. Advisory: Add warning for number of active users metric status

Co-authored-by: Catalin Tomai <catalin.tomai@mattermost.com>

model/system.go

@@ -10,16 +10,26 @@ import (
 )
 
 const (
-	SYSTEM_DIAGNOSTIC_ID                  = "DiagnosticId"
-	SYSTEM_RAN_UNIT_TESTS                 = "RanUnitTests"
-	SYSTEM_LAST_SECURITY_TIME             = "LastSecurityTime"
-	SYSTEM_ACTIVE_LICENSE_ID              = "ActiveLicenseId"
-	SYSTEM_LAST_COMPLIANCE_TIME           = "LastComplianceTime"
-	SYSTEM_ASYMMETRIC_SIGNING_KEY         = "AsymmetricSigningKey"
-	SYSTEM_POST_ACTION_COOKIE_SECRET      = "PostActionCookieSecret"
-	SYSTEM_INSTALLATION_DATE_KEY          = "InstallationDate"
-	SYSTEM_FIRST_SERVER_RUN_TIMESTAMP_KEY = "FirstServerRunTimestamp"
-	SYSTEM_CLUSTER_ENCRYPTION_KEY         = "ClusterEncryptionKey"
+	SYSTEM_DIAGNOSTIC_ID                          = "DiagnosticId"
+	SYSTEM_RAN_UNIT_TESTS                         = "RanUnitTests"
+	SYSTEM_LAST_SECURITY_TIME                     = "LastSecurityTime"
+	SYSTEM_ACTIVE_LICENSE_ID                      = "ActiveLicenseId"
+	SYSTEM_LAST_COMPLIANCE_TIME                   = "LastComplianceTime"
+	SYSTEM_ASYMMETRIC_SIGNING_KEY                 = "AsymmetricSigningKey"
+	SYSTEM_POST_ACTION_COOKIE_SECRET              = "PostActionCookieSecret"
+	SYSTEM_INSTALLATION_DATE_KEY                  = "InstallationDate"
+	SYSTEM_FIRST_SERVER_RUN_TIMESTAMP_KEY         = "FirstServerRunTimestamp"
+	SYSTEM_CLUSTER_ENCRYPTION_KEY                 = "ClusterEncryptionKey"
+	SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_200 = "warn_metric_number_of_active_users_200"
+	SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_400 = "warn_metric_number_of_active_users_400"
+	SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_500 = "warn_metric_number_of_active_users_500"
+)
+
+const (
+	WARN_METRIC_STATUS_LIMIT_REACHED = "true"
+	WARN_METRIC_STATUS_RUNONCE       = "runonce"
+	WARN_METRIC_STATUS_ACK           = "ack"
+	WARN_METRIC_STATUS_STORE_PREFIX  = "warn_metric_"
 )
 
 type System struct {
@@ -70,3 +80,78 @@ func ServerBusyStateFromJson(r io.Reader) *ServerBusyState {
 	json.NewDecoder(r).Decode(&sbs)
 	return sbs
 }
+
+var WarnMetricsTable = map[string]WarnMetric{
+	SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_200: {
+		Id:        SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_200,
+		Limit:     200,
+		IsBotOnly: true,
+		IsRunOnce: true,
+	},
+	SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_400: {
+		Id:        SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_400,
+		Limit:     400,
+		IsBotOnly: true,
+		IsRunOnce: true,
+	},
+	SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_500: {
+		Id:        SYSTEM_WARN_METRIC_NUMBER_OF_ACTIVE_USERS_500,
+		Limit:     500,
+		IsBotOnly: false,
+		IsRunOnce: false,
+	},
+}
+
+type WarnMetric struct {
+	Id        string
+	Limit     int64
+	IsBotOnly bool
+	IsRunOnce bool
+}
+
+type WarnMetricDisplayTexts struct {
+	BotTitle       string
+	BotMessageBody string
+	BotMailToBody  string
+	EmailBody      string
+}
+type WarnMetricStatus struct {
+	Id          string `json:"id"`
+	Limit       int64  `json:"limit"`
+	Acked       bool   `json:"acked"`
+	StoreStatus string `json:"store_status,omitempty"`
+}
+
+func (wms *WarnMetricStatus) ToJson() string {
+	b, _ := json.Marshal(wms)
+	return string(b)
+}
+
+func WarnMetricStatusFromJson(data io.Reader) *WarnMetricStatus {
+	var o WarnMetricStatus
+	if err := json.NewDecoder(data).Decode(&o); err != nil {
+		return nil
+	} else {
+		return &o
+	}
+}
+
+func MapWarnMetricStatusToJson(o map[string]*WarnMetricStatus) string {
+	b, _ := json.Marshal(o)
+	return string(b)
+}
+
+type SendWarnMetricAck struct {
+	ForceAck bool `json:"forceAck"`
+}
+
+func (swma *SendWarnMetricAck) ToJson() string {
+	b, _ := json.Marshal(swma)
+	return string(b)
+}
+
+func SendWarnMetricAckFromJson(r io.Reader) *SendWarnMetricAck {
+	var swma *SendWarnMetricAck
+	json.NewDecoder(r).Decode(&swma)
+	return swma
+}