Merge remote-tracking branch 'origin/pr945' into codex/cctv-shared-batch-20261019

changelog.d/945-cctv-vegvesen-kartverket-heights.md

@@ -7,9 +7,11 @@
   time; a cold lookup takes about 6–13 s. Cameras over water use the water
   surface rather than the sea-floor depth the API returns there; for bridge
   cameras that is still below the deck. Heights are cached for good and misses
-  for 6 h, so a refresh only asks about new or moved cameras. After a 429, a
-  5xx or a network failure the lookup stops and backs off (Retry-After, else
-  10 min). The lane waits at most 12 s from its start; a slower first lookup
-  leaves the cameras it had not reached on the flat prior until the next
-  15-minute refresh, and keeps filling the cache meanwhile.
+  for 6 h, so a refresh only asks about new or moved cameras. After a
+  failing request (a 408, 429 or 5xx, a network error, a request over 10 s or
+  an unreadable body) the lookup stops and backs off (Retry-After, else
+  30 min, longer than the refresh). The lane waits at most 12 s from its
+  start, and only on a cold cache; a slower first lookup leaves the cameras it
+  had not reached on the flat prior until the next 15-minute refresh, and
+  keeps filling the cache meanwhile.
   `CCTV_VEGVESEN_HEIGHTS=0` turns it off. Follow-up to #929 (trygvehhh, #945).