The first two lines resulted from pressing F1 in Picard for Help. The rest of the log was recorded when I selected Looked Up a CD, and clicked on “Submit Disc ID” in the “CD Lookup” dialog:
D: 08:50:04,054 config.event:261: Config file update requested on thread 133731138105344
D: 08:50:17,378 config.event:261: Config file update requested on thread 133731138105344
D: 08:51:14,065 disc.read:65: Reading CD using device: b'/dev/sr0'
D: 08:51:17,017 disc._set_disc_details:91: Read disc ID vP23ty6Rpr7IcJZpyfb7V1Wu6PU- with MCN 0000000000000
D: 08:51:17,023 webservice/ratecontrol.get_delay_to_next_request:127: ('musicbrainz.org', 443): Last request was 1499721 ms ago, starting another one
D: 08:51:17,025 webservice/ratecontrol.increment_requests:147: ('musicbrainz.org', 443): Incrementing requests to: 1
D: 08:51:17,889 webservice/ratecontrol.decrement_requests:155: ('musicbrainz.org', 443): Decrementing requests to: 0
D: 08:51:17,890 webservice._handle_reply:559: Received reply for https://musicbrainz.org/ws/2/discid/vP23ty6Rpr7IcJZpyfb7V1Wu6PU-?cdstubs=no&inc=artist-credits%2Blabels -> HTTP 200 (OK)
D: 08:51:17,891 webservice._handle_reply:572: Response received: {'sectors': 350614, 'releases': [{'label-info': [{'label': {'disambiguation': '', 'label-code': None, 'type-id': 'a2426aab-2dd4-339c-b47d-b4923a241678', 'sort-name': 'Musical Concepts', 'id': '800772a0-4e3f-4ef8-a826-0e4cc3faacf9', 'name': 'Musical Concepts', 'type': 'Production'}, 'catalog-number': 'MC 151'}], 'cover-art-archive': {'darkened': False, 'artwork': True, 'back': True, 'front': True, 'count': 5}, 'disambiguation': '', 'date': '2014', 'title': 'The Piper of Dreams', 'text-representation': {'language': 'eng', 'script': 'Latn'}, 'barcode': '5055354471513', 'packaging-id': 'ec27701a-4a22-37f4-bfac-6616e0f9750a', 'quality': 'normal', 'media': [{'format': 'CD', 'track-count': 17, 'title': '', 'position': 1, 'id': '65338de8-ffb0-43fc-9bca-2615df93ac76', 'format-id': '9712d52a-4509-3d4b-a1a2-67c88c643e31', 'discs': [{'id': 'vP23ty6Rpr7IcJZpyfb7V1Wu6PU-', 'sectors': 350614, 'offset-count': 17, 'offsets': [150, 18870, 41940, 62086, 87549, 100636, 123474, 153047, 188282, 239237, 276468, 287433, 294978, 301788, 315948, 326613, 340654]}]}], 'packaging': 'Jewel Case', 'asin': None, 'artist-credit': [{'joinphrase': '', 'artist': {'type': 'Person', 'name': 'Christopher Ball', 'id': 'bada67ae-c8de-4c44-ae78-b090e9b1fded', 'sort-name': 'Ball, Christopher', 'type-id': 'b6e035f4-3ce9-331c-97df-83397230b0df', 'country': 'GB', 'disambiguation': 'musician'}, 'name': 'Christopher Ball'}], 'status-id': '4e304316-386d-3409-af2e-78857eec5cfe', 'country': 'XE', 'id': '4b4cb418-8211-491b-bfbe-337fb7ba8ae6', 'status': 'Official', 'release-events': [{'area': {'type-id': None, 'type': None, 'name': 'Europe', 'id': '89a675c2-3e37-3518-b83c-418bad59a85a', 'sort-name': 'Europe', 'disambiguation': '', 'iso-3166-1-codes': ['XE']}, 'date': '2014'}]}], 'offset-count': 17, 'offsets': [150, 18870, 41940, 62086, 87549, 100636, 123474, 153047, 188282, 239237, 276468, 287433, 294978, 301788, 315948, 326613, 340654], 'id': 'vP23ty6Rpr7IcJZpyfb7V1Wu6PU-'}
D: 08:51:17,908 ui/cdlookup.restore_header_state:140: restore_state: cdlookupdialog_header_state
D: 08:51:20,117 browser/filelookup.launch:80: webbrowser2: https://musicbrainz.org/cdtoc/attach?id=vP23ty6Rpr7IcJZpyfb7V1Wu6PU-&tracks=17&toc=1+17+350614+150+18870+41940+62086+87549+100636+123474+153047+188282+239237+276468+287433+294978+301788+315948+326613+340654&tport=8000
D: 08:51:20,126 ui/cdlookup.save_header_state:147: save_state: cdlookupdialog_header_state
D: 08:51:20,132 webservice/ratecontrol._out_of_backoff:231: ('musicbrainz.org', 443): oobackoff; delay: 1000ms -> 1000ms; slow start; window size 9.000 -> 10.000
D: 08:51:20,133 config.event:261: Config file update requested on thread 133731138105344