Merge pull request #3905 from alphagov/PAAS-114-repeat-cf-instance-re…

…duction

Reduced log cache instances

Author: DominicGriffin

manifests/cf-manifest/env-specific/prod-lon.yml

@@ -6,7 +6,7 @@ cell_instances: 15
 router_instances: 6
 api_instances: 6
 doppler_instances: 12
-log_cache_instances: 10
+log_cache_instances: 8
 log_api_instances: 6
 scheduler_instances: 4
 cc_worker_instances: 4