[metadata] update communities

data/communities/metadata.yaml

@@ -1,34 +1,58 @@
 # Generated by meta-updater communities. Do not edit by hand.
 # Descriptions, artwork, and activity figures come from the linked platforms.
+beman-discord:
+  description: Our mission is to support the efficient design and adoption of the highest quality C++ Standard libraries through implementation experience, user feedback, and technical expertise.
+  avatar_url: https://cdn.discordapp.com/icons/1457903855898460405/c6ca9733686793795c2c68ecc11b800b.png?size=512
+  banner_url: ''
+  member_count: 107
+  weekly_visitors: null
+  weekly_contributions: null
+  source_url: https://discord.com/api/v10/invites/BKpNyJgSbm?with_counts=true
+beman-discourse:
+  description: Beman Project provides free peer-reviewed portable C++ source libraries, to be integrated with Standard C++
+  avatar_url: https://canada1.discourse-cdn.com/flex029/uploads/boost/optimized/1X/f4254f94f25cdc63ca3be8e68015b55c45f81375_2_180x180.jpeg
+  banner_url: https://canada1.discourse-cdn.com/flex029/uploads/boost/original/1X/f4254f94f25cdc63ca3be8e68015b55c45f81375.jpeg
+  member_count: null
+  weekly_visitors: null
+  weekly_contributions: null
+  source_url: https://discourse.bemanproject.org/
 better-cpp:
   description: A welcoming community for C++ developers of all experience levels. Whether you're just starting out, improving your skills, working on complex projects, or exploring advanced topics, this is a place to ask questions, share knowledge, and discuss everything related to C++.
   avatar_url: https://cdn.discordapp.com/icons/583251190591258624/a_49d8a41e3f8b67c9e11ea45a896f971d.png?size=512
   banner_url: https://cdn.discordapp.com/banners/583251190591258624/c38d7fad62ee402911142dd8627bd5a2.jpg?size=1024
-  member_count: 16138
+  member_count: 16143
   weekly_visitors: null
   weekly_contributions: null
   source_url: https://discord.com/api/v10/invites/YWfdM2tctt?with_counts=true
 cpp-discord:
   description: discord.gg/cpp
   avatar_url: https://cdn.discordapp.com/icons/1130464154344493166/2eada683c69b96c60da48894ba505a4e.png?size=512
   banner_url: https://cdn.discordapp.com/banners/1130464154344493166/feb429be8a5e5f9874c7b45a1dbff517.jpg?size=1024
-  member_count: 16848
+  member_count: 17123
   weekly_visitors: null
   weekly_contributions: null
   source_url: https://discord.com/api/v10/invites/uxuWKB2aNe?with_counts=true
+cpplang-slack:
+  description: The C++ Alliance is dedicated to helping the C++ programming language evolve. We see it developing as an ecosystem of open source libraries and as a growing community of those who contribute to those libraries..
+  avatar_url: https://cppalliance.org/apple-touch-icon.png?v=1
+  banner_url: ''
+  member_count: null
+  weekly_visitors: null
+  weekly_contributions: null
+  source_url: https://cppalliance.org/slack/
 include-cpp:
   description: ''
   avatar_url: https://cdn.discordapp.com/icons/400588936151433218/150153a93667a8d9058b554bdf8ac146.png?size=512
   banner_url: https://cdn.discordapp.com/banners/400588936151433218/65b97e2471e7241da7c91c15ab75a4a1.jpg?size=1024
-  member_count: 9911
+  member_count: 9906
   weekly_visitors: null
   weekly_contributions: null
   source_url: https://discord.com/api/v10/invites/vSYgpmPrra?with_counts=true
 llvm-discord:
   description: LLVM Project Discord Server
   avatar_url: https://cdn.discordapp.com/icons/636084430946959380/39c76d2feed66d4360e7311378539a7e.png?size=512
   banner_url: ''
-  member_count: 17371
+  member_count: 17384
   weekly_visitors: null
   weekly_contributions: null
   source_url: https://discord.com/api/v10/invites/2kQU7PCuys?with_counts=true
@@ -56,3 +80,11 @@ reddit-cpp-questions:
   weekly_visitors: 60536
   weekly_contributions: 984
   source_url: https://www.reddit.com/r/cpp_questions/
+stack-overflow-cpp:
+  description: ''
+  avatar_url: https://cdn.sstatic.net/Sites/stackoverflow/Img/apple-touch-icon.png
+  banner_url: ''
+  member_count: null
+  weekly_visitors: null
+  weekly_contributions: null
+  source_url: https://api.stackexchange.com/2.3/tags/c%2B%2B/info?site=stackoverflow

data/communities/provenance.yaml

@@ -1,10 +1,14 @@
 # Generated by meta-updater. Do not edit by hand.
-retrieved_at: '2026-09-15'
+retrieved_at: '2026-09-22'
 source_urls:
+- https://api.stackexchange.com/2.3/tags/c%2B%2B/info?site=stackoverflow
+- https://cppalliance.org/slack/
 - https://discord.com/api/v10/invites/2kQU7PCuys?with_counts=true
+- https://discord.com/api/v10/invites/BKpNyJgSbm?with_counts=true
 - https://discord.com/api/v10/invites/YWfdM2tctt?with_counts=true
 - https://discord.com/api/v10/invites/uxuWKB2aNe?with_counts=true
 - https://discord.com/api/v10/invites/vSYgpmPrra?with_counts=true
+- https://discourse.bemanproject.org/
 - https://www.reddit.com/r/Cplusplus/
 - https://www.reddit.com/r/cpp/
 - https://www.reddit.com/r/cpp_questions/