doc: write tcm release notes

Author: mar

doc/tooling/tcm/tcm_releases/index.rst

@@ -26,9 +26,15 @@ Supported versions
             -   First release date
             -   Versions
 
+        *   -   :ref:`1.6 <tcm_releases_1_6>`
+            -   February 06, 2026
+            -   | 1.6.0
+
         *   -   :ref:`1.5 <tcm_releases_1_5>`
             -   August 28, 2025
-            -   | 1.5.1
+            -   | 1.5.3
+                | 1.5.2
+                | 1.5.1
                 | 1.5.0
 
         *   -   :ref:`1.4 <tcm_releases_1_4>`
@@ -61,6 +67,7 @@ Supported versions
 ..  toctree::
     :maxdepth: 1
 
+    tcm_1.6
     tcm_1.5
     tcm_1.4
     tcm_1.3

doc/tooling/tcm/tcm_releases/tcm_1.5.rst

@@ -5,7 +5,7 @@ Tarantool Cluster Manager 1.5
 
 Release date: August 28, 2025
 
-Latest release in series: 1.5.1
+Latest release in series: 1.5.3
 
 |tcm_full_name| 1.5.0 introduces a new UI page for configuring TCF clusters and includes important fixes that enhance reliability, compliance, and user experience.
 
@@ -55,7 +55,8 @@ This release includes multiple fixes across different modules:
 - Tuples -- fixed an error that caused tab refresh failures in clusters with a large number of spaces.
 - ``utils`` — the ``FilterSlices`` function to correctly filter slices. Since version 1.5.1.
 - :ref:`Audit log <tcm_audit_log>` documentation now contains only necessary event types. Since version 1.5.1.
-
+- fixed issue when adding a new role, the **Permissions** drop-down list had multiple empty lines at the bottom. Since version 1.5.2.
+-
 
 .. _tcm_releases_1_5_1:
 
@@ -64,3 +65,29 @@ Migrations section
 
 Since version 1.5.1, |tcm| includes a new ``migrations`` section with a ``duration`` field.
 This field allows specifying the maximum execution time for long-running migrations, preventing them from being interrupted by the default timeout.
+
+.. _tcm_releases_1_5_3:
+
+Cluster reliability
+-------------------
+
+|tcm| 1.5.3 improves overall cluster stability, fault tolerance, and configuration handling.
+The cluster now automatically reconnects after transient failures and continuously monitors node health to detect degraded or unavailable instances faster.
+Configuration changes are applied correctly without disrupting cluster operation.
+Quorum and health check logic were reworked to better tolerate partial failures. Unavailable nodes are now excluded from quorum calculations,
+preventing cluster-wide outages when only a minority of nodes becomes unavailable.
+
+The following issues were fixed:
+
+- incorrect quorum calculation when some nodes were down.
+- unstable health check behavior under partial failures.
+- ``cluster not found`` error when adding or editing cluster settings.
+
+
+Migration management improvements
+---------------------------------
+
+Also, |tcm| 1.5.3 makes migration handling safer and more predictable.
+Applied migrations are now automatically locked from editing. Executed migrations are clearly marked as read-only in the interface,
+and the UI displays an explanatory message to indicate that modifications are not allowed.
+This prevents accidental changes to already executed migrations and ensures migration history consistency.

doc/tooling/tcm/tcm_releases/tcm_1.6.rst

@@ -0,0 +1,60 @@
+.. _tcm_releases_1_6:
+
+Tarantool Cluster Manager 1.6
+=============================
+
+Release date: February 6, 2026
+
+Latest release in series: 1.6.0
+
+This release introduces support for TDB workers in the cluster dashboard with integrated health monitoring,
+adds TLS configuration guides for secure connections, improves audit log configuration and validation,
+and introduces a feature flag for managing the Tuples tab. It also includes important fixes for LDAP authentication,
+TLS configuration parsing, and a memory leak in SSL cluster connections.
+
+.. _tcm_releases_1_6_workers_tdb:
+
+TDB workers monitoring in cluster dashboard
+--------------------------------------------
+
+|tcm| adds support for TDB workers in the cluster dashboard with integrated health monitoring and visibility.
+
+Workers are automatically discovered from etcd and continuously monitored via dedicated health check endpoints.
+Their metrics are proxied through TCM and exposed individually, allowing detailed operational insight.
+
+The interface displays workers directly in the stateboard with clear status indicators and a details panel.
+Each worker can be in one of four states: healthy, degraded, unhealthy, or no connection, helping administrators quickly detect and diagnose issues.
+
+.. _tcm_releases_1_6_audit_log:
+
+Audit log configuration improvements
+------------------------------------
+
+The audit log configuration is now safer and more predictable.
+
+Protocol values are validated during startup. If an invalid protocol is specified, the system automatically falls back to default settings and emits a warning.
+Audit log parameters can be set in advance at the system bootstrap stage by specifying them in the ``auditlog`` field of the initial-settings section in the configuration file.
+These settings will be applied automatically if the audit log has not been configured yet.
+
+.. _tcm_releases_1_6_explorer:
+
+Explorer enhancements
+---------------------
+
+A feature flag has been introduced to control the visibility of the **Tuples** tab in the Explorer interface.
+
+The tab is displayed only when the corresponding feature flag is enabled and the CRUD module is available.
+The flag can be configured either in the application configuration file or via command-line arguments at startup
+
+.. _tcm_releases_1_6_fixes:
+
+Stability and reliability fixes
+-------------------------------
+
+This release also includes several fixes that improve system stability and security.
+
+LDAP authentication behavior has been adjusted, including logout handling, anonymous binding to Active Directory, and the preservation of authorization method settings after a restart.
+TLS configuration parsing has been fixed to ensure cipher suites and curve preferences are correctly recognized in both configuration files and command-line arguments.
+Missing schema attributes for cluster configuration have been added, and configuration validation feedback in the editor has been improved.
+
+Additionally, a memory leak that could occur when SSL-enabled cluster connections became unavailable has been resolved, resulting in more stable cluster operation.

doc/tooling/tcm/tcm_ui_overview.rst

@@ -424,7 +424,6 @@ TCF page can be added via the |tcm| configuration file:
     feature:
         tcf:True
 
-
 On this page, you can:
 
 *   view information about TCF clusters