I set this up on a non live server.

fstab file:
LABEL=cloudimg-rootfs / ext4 defaults 0 1
LABEL=UEFI /boot/efi vfat umask=0077 0 1

ctwebcust-test-prwdr /var/www/html/prwdr gcsfuse rw,allow_other,file_mode=777,dir_mode=777,implicit_dirs,debug_gcs,debug_fs,debug_fuse,log_file=/var/log/fuse.log,key_file=/usr/key.json

Log after reboot: (does not get mounted) - just seems to stop
{"name":"root","levelname":"INFO","severity":"INFO","message":"Start gcsfuse/0.42.3 (Go version go1.19.5) for app "" using mount point: /var/www/html/prwdr\n","timestampSeconds":1681132871,"timestampNanos":809785695}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Opening GCS connection...\n","timestampSeconds":1681132871,"timestampNanos":809927336}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Creating a mount at "/var/www/html/prwdr"\n","timestampSeconds":1681132871,"timestampNanos":869427943}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Creating a new server...\n","timestampSeconds":1681132871,"timestampNanos":869474692}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Set up root directory for bucket ctwebcust-test-prwdr\n","timestampSeconds":1681132871,"timestampNanos":869503712}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"gcs: Req 0x0: \u003c- ListObjects("")\n","timestampSeconds":1681132871,"timestampNanos":869520903}

Returned after a manual sudo mount -a
{"name":"root","levelname":"INFO","severity":"INFO","message":"Start gcsfuse/0.42.3 (Go version go1.19.5) for app "" using mount point: /var/www/html/prwdr\n","timestampSeconds":1681132871,"timestampNanos":809785695}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Opening GCS connection...\n","timestampSeconds":1681132871,"timestampNanos":809927336}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Creating a mount at "/var/www/html/prwdr"\n","timestampSeconds":1681132871,"timestampNanos":869427943}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Creating a new server...\n","timestampSeconds":1681132871,"timestampNanos":869474692}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Set up root directory for bucket ctwebcust-test-prwdr\n","timestampSeconds":1681132871,"timestampNanos":869503712}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"gcs: Req 0x0: \u003c- ListObjects("")\n","timestampSeconds":1681132871,"timestampNanos":869520903}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Start gcsfuse/0.42.3 (Go version go1.19.5) for app "" using mount point: /var/www/html/prwdr\n","timestampSeconds":1681133139,"timestampNanos":58349370}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Opening GCS connection...\n","timestampSeconds":1681133139,"timestampNanos":58632200}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Creating a mount at "/var/www/html/prwdr"\n","timestampSeconds":1681133139,"timestampNanos":118089066}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Creating a new server...\n","timestampSeconds":1681133139,"timestampNanos":118186606}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Set up root directory for bucket ctwebcust-test-prwdr\n","timestampSeconds":1681133139,"timestampNanos":121399457}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"gcs: Req 0x0: \u003c- ListObjects("")\n","timestampSeconds":1681133139,"timestampNanos":121569027}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"gcs: Req 0x0: -\u003e ListObjects("") (139.9024ms): OK\n","timestampSeconds":1681133139,"timestampNanos":261479107}
{"name":"root","levelname":"INFO","severity":"INFO","message":"Mounting file system "ctwebcust-test-prwdr"...\n","timestampSeconds":1681133139,"timestampNanos":261928837}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Beginning the mounting kickoff process\n","timestampSeconds":1681133139,"timestampNanos":262078687}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Parsing fuse file descriptor\n","timestampSeconds":1681133139,"timestampNanos":262092637}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Preparing for direct mounting\n","timestampSeconds":1681133139,"timestampNanos":262134047}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Successfully opened the /dev/fuse in blocking mode\n","timestampSeconds":1681133139,"timestampNanos":262167557}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Starting the unix mounting\n","timestampSeconds":1681133139,"timestampNanos":262204567}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Unix mounting completed successfully\n","timestampSeconds":1681133139,"timestampNanos":265095568}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Completed the mounting kickoff process\n","timestampSeconds":1681133139,"timestampNanos":265113558}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Creating a connection object\n","timestampSeconds":1681133139,"timestampNanos":265121418}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Op 0x00000002 connection.go:416] \u003c- init\n","timestampSeconds":1681133139,"timestampNanos":277011133}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Op 0x00000002 connection.go:498] -\u003e OK ()\n","timestampSeconds":1681133139,"timestampNanos":277085693}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Successfully created the connection\n","timestampSeconds":1681133139,"timestampNanos":277159034}
{"name":"root","levelname":"DEBUG","severity":"DEBUG","message":"fuse_debug: Waiting for mounting process to complete\n","timestampSeconds":1681133139,"timestampNanos":277173954}
{"name":"root","levelname":"INFO","severity":"INFO","message":"File system has been successfully mounted.\n","timestampSeconds":1681133139,"timestampNanos":277180583}

THANKS

Originally posted by @gcontois in #1043 (comment)