add env variable names to example config file

README.md

@@ -2,4 +2,6 @@
 
 This app listens on a UDP port. Parses packets with a specific signature. Buffers the packet payloads and writes them to disk.
 
-Probably not what you want but works for us. maybe.
+Allows us to efficiently transport logs out of the PHP app and directly to the system with the hard disk where we store log files.
+
+See [config file example](https://github.com/Notifiarr/fogwillow/blob/main/fog.conf).

fog.conf

@@ -1,21 +1,22 @@
-# IP and port to listen on.
-listen_addr    = ":12345"
-# How old an item must be to flush it to disk.
+# FW_LISTEN_ADDR: IP and port to listen on.
+listen_addr = ":12345"
+# FW_FLUSH_INTERVAL: How old an item must be to flush it to disk.
 flush_interval = "16s"
-# How often to scan everything for flushable files.
+# FW_GROUP_INTERVAL: How often to scan everything for flushable files.
 group_interval = "4s"
-# This is prefixed to whatever comes in over the wire.
-output_path    = "/tmp"
-# This should be a full path, probably /config/fog.log.
-log_file       = ""
-# Set these too if you set a log file path.
-log_file_mb    = 0
-log_files      = 0
-# This is the UDP socket buffer.
-buffer_udp     = 1048576
-# This is the size of the read buffer we use.
-buffer_packet  = 102400
-# This is how many items fit in memory before we drop packets. maybe.
+# FW_OUTPUT_PATH: This is prefixed to whatever comes in over the wire.
+output_path  = "/tmp"
+# FW_LOG_FILE: This should be a full path, probably /config/fog.log.
+log_file = ""
+# FW_LOG_FILE_MB: Size of each log file.
+log_file_mb = 0
+# FW_LOG_FILES: How many logs files to keep around.
+log_files = 0
+# FW_BUFFER_UDP: This is the UDP socket buffer.
+buffer_udp = 1048576
+# FW_BUFFER_PACKET: This is the size of the read buffer we use.
+buffer_packet = 102400
+# FW_BUFFER_CHANNEL: This is how many items fit in memory before we drop packets. maybe.
 buffer_channel = 10240
-# Prints 1 line per packet when enabled.
-debug          = false
+# FW_DEBUG: Prints 1 line per packet when enabled.
+debug = false