Fix timing of async functions and make histogram finer at lower ranges

telegram_downloader_bot/telemetry.py

@@ -1,10 +1,10 @@
 from prometheus_client import Histogram, start_http_server
 
 DOWNLOAD_DURATION = Histogram(
-    'tt_download_time',
-    'Time taken to download a single tiktok video',
+    'download_time_seconds',
+    'Time taken to download a single media item',
     ['service'],
-    buckets=[0.1, 0.5, 1, 2, 5, 10, 30, 60, 120]
+    buckets=[0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, 100]
 )
 
 FILE_SIZE_BYTES = Histogram(
@@ -13,6 +13,7 @@ FILE_SIZE_BYTES = Histogram(
     ['service'],
     buckets=[
         1e6,    # 1 MB
+        2e6,    # 2 MB
         5e6,    # 5 MB
         10e6,   # 10 MB
         25e6,   # 25 MB