Reduce nginx ssl_session_cache to 3m each

core/nginx/conf/nginx.conf

@@ -100,7 +100,7 @@ http {
       include /etc/nginx/tls.conf;
       ssl_stapling on;
       ssl_stapling_verify on;
-      ssl_session_cache shared:SSLHTTP:50m;
+      ssl_session_cache shared:SSLHTTP:3m;
       add_header Strict-Transport-Security 'max-age=31536000';
 
       {% if not TLS_FLAVOR in [ 'mail', 'mail-letsencrypt' ] %}
@@ -284,7 +284,7 @@ mail {
 
     {% if TLS and not TLS_ERROR %}
     include /etc/nginx/tls.conf;
-    ssl_session_cache shared:SSLMAIL:50m;
+    ssl_session_cache shared:SSLMAIL:3m;
     {% endif %}
 
     # Advertise real capabilities of backends (postfix/dovecot)

towncrier/newsfragments/2605.misc

@@ -0,0 +1 @@
+Reduce the SSL session caches from 50m each to 3m each. This should be good for 12k sessions (within 1day) for each cache and will help reduce memory usage.