fix: Initialize Prometheus healthy/recording metrics with current status

The `jitsi_jibri_healthy` and `jitsi_jibri_recording` Prometheus gauges
default to 0 and only update on status transitions via publishStatus().
Since Jibri starts healthy with no transition, the metrics remain at 0
even though the instance is healthy.

Seed the metrics with the current status immediately after registering
the status handler so they reflect the actual state from startup.

Fixes #590

Author: mozkomor05

src/main/kotlin/org/jitsi/jibri/Main.kt

@@ -81,6 +81,7 @@ fun main(args: Array<String>) {
     jibriStatusManager.addStatusHandler {
         jibriManager.jibriMetrics.updateStatus(it)
     }
+    jibriManager.jibriMetrics.updateStatus(jibriStatusManager.overallStatus)
     webhookSubscribers.forEach(webhookClient::addSubscriber)
     val statusUpdaterTask = TaskPools.recurringTasksPool.scheduleAtFixedRate(
         1,

src/test/kotlin/org/jitsi/jibri/metrics/JibriMetricsTest.kt

@@ -0,0 +1,75 @@
+/*
+ * Copyright @ 2024-Present 8x8, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+package org.jitsi.jibri.metrics
+
+import io.kotest.core.spec.style.ShouldSpec
+import io.kotest.matchers.shouldBe
+import org.jitsi.jibri.status.ComponentBusyStatus
+import org.jitsi.jibri.status.ComponentHealthStatus
+import org.jitsi.jibri.status.JibriStatus
+import org.jitsi.jibri.status.JibriStatusManager
+import org.jitsi.jibri.status.OverallHealth
+
+class JibriMetricsTest : ShouldSpec({
+    context("Prometheus healthy metric") {
+        should("reflect healthy status when seeded with initial state") {
+            val metrics = JibriMetrics()
+            val statusManager = JibriStatusManager()
+
+            // Register handler (like Main.kt does)
+            statusManager.addStatusHandler {
+                metrics.updateStatus(it)
+            }
+
+            // Without the fix, healthy stays at 0.0 because no status
+            // transition has occurred. With the fix, we seed the initial state:
+            metrics.updateStatus(statusManager.overallStatus)
+
+            JibriMetrics.healthy.get() shouldBe true
+            JibriMetrics.recording.get() shouldBe false
+        }
+
+        should("report 0 when unhealthy") {
+            val metrics = JibriMetrics()
+            val status = JibriStatus(
+                busyStatus = ComponentBusyStatus.IDLE,
+                health = OverallHealth(
+                    healthStatus = ComponentHealthStatus.UNHEALTHY,
+                    details = emptyMap()
+                )
+            )
+            metrics.updateStatus(status)
+
+            JibriMetrics.healthy.get() shouldBe false
+        }
+
+        should("report recording=1 when busy") {
+            val metrics = JibriMetrics()
+            val status = JibriStatus(
+                busyStatus = ComponentBusyStatus.BUSY,
+                health = OverallHealth(
+                    healthStatus = ComponentHealthStatus.HEALTHY,
+                    details = emptyMap()
+                )
+            )
+            metrics.updateStatus(status)
+
+            JibriMetrics.healthy.get() shouldBe true
+            JibriMetrics.recording.get() shouldBe true
+        }
+    }
+})