add grafana dashboard

README.md

@@ -72,6 +72,7 @@ opening the app and hitting "Start" button.
 - Folder `local` contains simple docker-compose.yaml files to spin up prometheus database on localhost
     quickly for testing purposes with desired configuration.
 - Configuration options for the YAML file are described in `config_file_structure.yaml`.
+- Grafana dashboard as an exported json is present in file `grafana_dashboard.json`.
 
 
 ## Some helpful information for development

client/app/src/main/java/com/birdthedeveloper/prometheus/android/exporter/worker/RemoteWriteSender.kt

@@ -33,7 +33,7 @@ internal class LastTimeRingBuffer(private val scrapeInterval: Int) {
     companion object {
         private const val hysteresisMemory: Int = 3
         private const val hysteresisCoefficient: Double = 1.2
-        private const val scrapeTimeCoefficient: Double = 2.2
+        private const val scrapeTimeCoefficient: Double = 1.7
     }
 
     fun setLastTime(timestamp: Long) {