Log time at which heartbeat is sent

Author: mokagio

Sources/Sampler.swift

@@ -147,13 +147,20 @@ class Sampler {
             os_log("No accumulator found for %s, skipping sendHeartbeat", log: OSLog.tracker, type:.debug, key)
             return
         }
+        let now = Date()
         let incSecs: TimeInterval = trackedData.accumulatedTime
         if incSecs > 0 {
-            os_log("Sending heartbeat for %s", log: OSLog.tracker, type:.debug, key)
+            os_log(
+                "Sending heartbeat for %s. Timestamp: %s.",
+                log: OSLog.tracker,
+                type:.debug,
+                key,
+                now.description
+            )
             heartbeatFn(data: trackedData, enableHeartbeats: true)
         }
         trackedData.accumulatedTime = 0
-        let totalTrackedTime: TimeInterval = Date().timeIntervalSince(trackedData.firstSampleTime!)
+        let totalTrackedTime: TimeInterval = now.timeIntervalSince(trackedData.firstSampleTime!)
         trackedData.heartbeatTimeout = getHeartbeatInterval(
             existingTimeout: trackedData.heartbeatTimeout!,
             totalTrackedTime: totalTrackedTime