Since the introduction of the synapse-usage-exporter role (55f869254, #3442), group_vars/matrix_servers was overriding matrix_synapse_report_stats_endpoint with an empty string whenever synapse-usage-exporter was disabled, clobbering the role's matrix.org default.

For deployments that enable matrix_synapse_report_stats, Synapse would then try reporting statistics to an empty URL, failing with:

> synapse.app.homeserver - 210 - WARNING - phone_stats_home-0 - Error reporting stats: Invalid URI b''

The default endpoint URL now lives in a dedicated matrix_synapse_report_stats_endpoint_default variable, which group_vars/matrix_servers falls back to when synapse-usage-exporter is not enabled.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

None of these flags exist in current Synapse:

- msc3266_enabled: MSC3266 support was stabilized in Synapse v1.153.0 and the room summary API is now always enabled

- msc4140_enabled: this was never a Synapse configuration setting in any released version. Delayed events have always been controlled by the `max_event_delay_duration` setting, which the playbook was emitting alongside the flag. The toggle is now named `matrix_synapse_delayed_events_enabled`.

- msc4429_enabled: MSC4429 support has not landed in any released Synapse version, so this flag never had any effect

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

When no experimental features were enabled (e.g. Matrix RTC and Matrix Authentication Service both disabled), the generated homeserver.yaml contained `experimental_features: null`, which Synapse v1.157.0+ does not tolerate and crashes on startup.

The `experimental_features` configuration is now constructed via a dedicated `matrix_synapse_experimental_features` variable (split into `_default`, `_auto` and `_custom`, as is customary), which always yields a mapping (potentially an empty one).

Fixes https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/5455

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

With workers enabled, every Synapse process (the main one and each
worker) maintains its own database connection pool of up to
matrix_synapse_database_cp_max (default: 10) connections. The previous
fixed limit of 500 left little headroom on setups running many workers,
where exhausting it manifests as degraded performance and, reportedly,
E2EE misbehavior.

Size the limit as a 200-connection baseline (for everything else that
talks to Postgres) plus cp_max connections per Synapse process, never
going below the previous value of 500. The stock worker presets stay at
500; setups that raise worker counts (or cp_max) get a limit that grows
accordingly. The new matrix_synapse_workers_total_count variable
reflects what the matrix_synapse_workers_*_count variables ask for; it
does not reflect a manually populated
matrix_synapse_workers_enabled_list, and such setups should override
postgres_max_connections themselves.

Fixes #4442

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Introduces the `matrix_synapse_experimental_features_msc4429_enabled`
variable (disabled by default), allowing Synapse to notify clients
using the legacy /sync endpoint of profile changes for other users.

See <https://github.com/matrix-org/matrix-spec-proposals/pull/4429>

Signed-off-by: Norman Ziegner <n.ziegner@hzdr.de>

Replaces `community.docker.docker_image` with the modern
`docker_image_pull` and `docker_image_build` split modules across all
four task files (synapse, reverse_proxy_companion, goofys,
rust-synapse-compress-state). Drops the `ansible_version` compatibility
ladder and removes four `_container_image_force_pull` variables (the new
pull module handles registry refresh natively via `pull: always`).

The Synapse self-build path uses `ansible.builtin.shell` for BuildKit
support and is left as-is. The customizations image build (which builds
on top of the locally-tagged synapse image) is converted to
`docker_image_build` with `pull: false`, preserving its existing
rebuild-trigger semantics.

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/5191.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Synapse v1.152 introduces a new `quarantined_media_changes` stream and
requires that any worker serving `/_synapse/admin/v1/quarantine_media/`
be declared as a writer for that stream. Otherwise quarantining media
fails on the worker.

Add `quarantined_media_changes` as a web-facing stream writer alongside
the other stream-backed APIs and route the admin endpoint via the same
explicit writer-or-main model used for `device_lists`, `thread_subscriptions`,
etc. The endpoint is removed from `matrix_synapse_workers_media_repository_endpoints`
so the old media-repository route does not shadow (or conflict with) the
new writer-or-main route. Without that move, the previously-shipping
default of routing `/quarantine_media` to the `media_repository` worker
would silently break after the v1.152.0 image bump.

Default count is 1 in the `one-of-each` and `specialized-workers` presets
(matching `device_lists`), and 0 in `little-federation-helper` (which
also has no media-repository worker, so falling back to main is fine).

Refs:
- https://github.com/element-hq/synapse/blob/develop/docs/upgrade.md#upgrading-to-v11520
- https://element-hq.github.io/synapse/latest/workers.html#the-quarantined_media_changes-stream

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Register env, database config, scripts, and systemd service/timer results,
compute matrix_synapse_s3_storage_provider_restart_necessary, and wire it
into group_vars/matrix_servers instead of hardcoding restart_necessary: true.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Register image pull, env, and systemd service results, compute
matrix_goofys_restart_necessary, and wire it into group_vars/matrix_servers
instead of hardcoding restart_necessary: true.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Add support for all server_notices settings documented by Synapse:
- room_avatar_url: optional avatar for the server notices room
- room_topic: optional topic for the server notices room
- auto_join: whether users are auto-joined instead of invited (default: false)

Signed-off-by: Norman Ziegner <n.ziegner@hzdr.de>

Expose Synapse's `msc4306_enabled` experimental flag as a first-class MDAD
variable and wire it into `homeserver.yaml` alongside the other experimental
feature toggles.

This makes thread-subscriptions support explicit in playbook configuration,
rather than requiring operators to inject the upstream flag via raw
`matrix_synapse_configuration_extension_yaml`.

The variable intentionally controls only the Synapse feature flag. It does not
change the default `thread_subscriptions` worker count, which remains `0` in the
standard presets. Keeping those as separate choices avoids auto-starting an
experimental worker just because the upstream feature toggle is enabled.

Refs:
- b99a58719b/synapse/config/experimental.py (L600-L602)
- b99a58719b/synapse/rest/client/versions.py (L183-L184)

Add `thread_subscriptions` as a supported web-facing stream writer in MDAD and
route its unstable client endpoints via the same explicit writer-or-main model
used for the other web-facing stream-backed APIs.

This is not just another generic worker route. Current Synapse gives thread
subscriptions their own `writers.thread_subscriptions` configuration, backs them
with a multi-writer stream, and asserts on store writes that the current
instance is an allowed thread-subscriptions writer.

Explicit early routing is also required here because the subscription endpoint is
room-scoped. In MDAD's specialized-worker model, the existing room-worker regex
would otherwise match `/_matrix/client/unstable/io.element.msc4306/rooms/...`
and steal the request before it reached the correct writer-or-main fallback.

Unlike `device_lists`, support is added without enabling a thread-subscriptions
worker by default in the standard presets. The underlying MSC4306/4308 feature
remains unstable and disabled by default upstream, so the conservative default
is to keep the worker count at `0` and let the new explicit routes fall back to
`main` unless an operator opts in.

Refs:
- b99a58719b/synapse/config/workers.py (L175-L182)
- b99a58719b/synapse/rest/client/thread_subscriptions.py (L38-L247)
- b99a58719b/synapse/storage/databases/main/thread_subscriptions.py (L66-L83)
- b99a58719b/synapse/storage/databases/main/thread_subscriptions.py (L192-L322)

MDAD keeps `/_synapse/client/*` out of the broad worker-routing model.
Those paths are mounted by current Synapse on client-serving workers, but MDAD's
worker route buckets only match `/_matrix/client/*`, so `/_synapse/client/*`
requests already fall through to the main-process default.

That made the `/_synapse/client/*` branches in the dedicated SSO override regex
redundant. Remove those branches and leave the explicit SSO override focused on
the real `/_matrix/client/.../login/sso/redirect` path family, which would
otherwise be caught by the broad `/login` client-reader routing.

This also removes duplicated ownership of `login/sso/redirect` from the generic
main-override regex so the dedicated SSO override is the single place that
models that path.

Refs:
- b99a58719b/synapse/app/generic_worker.py (L197-L203)
- b99a58719b/synapse/rest/synapse/client/__init__.py (L39-L90)
- b99a58719b/synapse/rest/client/login.py (L636-L643)

Some client API endpoints (e.g. keys/upload) are backed by Synapse stream writers and
should not rely on broad worker regexes or route-order fallthrough for correctness.

When explicit per-stream routing is missing, requests may be captured by generic, room, or client_reader workers, instead of:
- going to the configured stream writer
- or to `main` when that stream writer is not enabled

This refactors synapse-reverse-proxy-companion's routing so that web-facing stream-backed endpoint families
are handled explicitly and early, with deterministic writer-or-main fallback.

Add first-class support for the missing `device_lists` stream writer,
generalize the same routing model to `push_rules`,
and remove stale broad-route ownership for device-list-sensitive endpoints.

Add matrix_synapse_ext_password_provider_ldap_tls_options_ca_certs_file
variable to allow specifying a custom CA certificate file for LDAP TLS
verification. Useful when Synapse is running in a container that does not
trust a private/internal CA by default.

Example usage:
matrix_synapse_ext_password_provider_ldap_tls_options_ca_certs_file: /etc/ssl/certs/my-ca.crt

This was causing issues when it's parsed out by certain tools.

Regression since 28afbde971

The companion role was tightly coupled to Synapse through shared tags, worker routing, and lifecycle ordering. Keeping them separate added coordination overhead without practical benefits, especially for parallelized execution.

This merges the role into matrix-synapse while keeping companion logic organized under dedicated reverse_proxy_companion task/template subdirectories.

Compatibility is preserved:
- matrix_synapse_reverse_proxy_companion_* variable names remain unchanged
- install/setup companion-specific tags remain available

Cross-role/global wiring is now in group_vars (matrix-synapse section), while role defaults provide sensible standalone defaults and self-wiring for Synapse-owned values.