feat(BRIDGE-37): Remote notification support

internal/services/notifications/metrics.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2024 Proton AG
+//
+// This file is part of Proton Mail Bridge.
+//
+// Proton Mail Bridge is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Proton Mail Bridge is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Proton Mail Bridge.  If not, see <https://www.gnu.org/licenses/>.
+
+package notifications
+
+import (
+	"time"
+
+	"github.com/ProtonMail/go-proton-api"
+)
+
+func generatedNotificationDisplayedMetric(status string, value int) proton.ObservabilityMetric {
+	// Value cannot be zero or negative
+	if value < 1 {
+		value = 1
+	}
+
+	return proton.ObservabilityMetric{
+		Name:      "bridge_remoteNotification_displayed_total",
+		Version:   1,
+		Timestamp: time.Now().Unix(),
+		Data: map[string]interface{}{
+			"Value": value,
+			"Labels": map[string]string{
+				"status": status,
+			},
+		},
+	}
+}
+
+func GenerateReceivedMetric(count int) proton.ObservabilityMetric {
+	return generatedNotificationDisplayedMetric("received", count)
+}
+
+func GenerateProcessedMetric(count int) proton.ObservabilityMetric {
+	return generatedNotificationDisplayedMetric("processed", count)
+}