update

http/gzip.conf

@@ -1,6 +1,9 @@
 # Enable gzip for common text-based responses.
 gzip on;
 gzip_vary on;
+
+# Keep the default compression level moderate so the CPU cost stays predictable
+# on small VPS instances.
 gzip_comp_level 4;
 gzip_min_length 256;
 
@@ -27,3 +30,6 @@ gzip_types
 	text/plain
 	text/xml
 	text/vtt;
+
+# Do not list text/html here. nginx already compresses it implicitly, and
+# repeating it suggests callers need to keep the two lists in sync.

http/log-format-upstream.conf

@@ -0,0 +1,23 @@
+# Define a reusable access log format with upstream timing fields, but do not
+# enable logging by default. Individual servers still choose their own log path
+# and whether this format is worth the I/O cost.
+#
+# Example:
+# access_log /var/log/nginx/access.log upstream_timing;
+log_format upstream_timing escape=json
+	'{'
+	'"time":"$time_iso8601",'
+	'"remote_addr":"$remote_addr",'
+	'"host":"$host",'
+	'"request":"$request",'
+	'"status":$status,'
+	'"body_bytes_sent":$body_bytes_sent,'
+	'"request_time":$request_time,'
+	'"upstream_addr":"$upstream_addr",'
+	'"upstream_status":"$upstream_status",'
+	'"upstream_connect_time":"$upstream_connect_time",'
+	'"upstream_header_time":"$upstream_header_time",'
+	'"upstream_response_time":"$upstream_response_time",'
+	'"http_referer":"$http_referer",'
+	'"http_user_agent":"$http_user_agent"'
+	'}';

http/websocket-map.conf

@@ -1,3 +1,5 @@
+# Map Upgrade to a reusable Connection value so websocket locations can opt in
+# without hard-coding "upgrade" for every request.
 map $http_upgrade $connection_upgrade {
 	default upgrade;
 	'' close;