Add MySQL/MariaDB variable capability matrix to Database section (#8188)

* Add MySQL/MariaDB variable capability matrix to Database section

* Add changelog fragment for PR #8188

* Address review: correct version boundaries, escaping, valid values, focusable hint, unit tests

* Normalize server version suffixes and cache the capability matrix

* Add capability matrix strings to the translation template

* Treat an unknown (null/empty) server version as supported to avoid a TypeError

* Cover the capability helpers in the installer coverage suite

---------

Co-authored-by: TheWitness <copilot@users.noreply.github.com>

locales/po/cacti.pot

@@ -24972,6 +24972,282 @@ msgstr ""
 msgid "No VDEFs"
 msgstr ""
 
+#: lib/utility.php:1147
+msgid ""
+"Default collation used by the server when creating databases and tables."
+msgstr ""
+
+#: lib/utility.php:1148
+msgid "e.g. utf8mb4_unicode_ci, utf8mb4_general_ci."
+msgstr ""
+
+#: lib/utility.php:1153
+msgid "Default character set used by the server."
+msgstr ""
+
+#: lib/utility.php:1154 lib/utility.php:1160
+msgid "e.g. utf8mb4, utf8, latin1."
+msgstr ""
+
+#: lib/utility.php:1159
+msgid "Character set the client uses when sending statements to the server."
+msgstr ""
+
+#: lib/utility.php:1165
+msgid "Maximum number of simultaneous client connections permitted."
+msgstr ""
+
+#: lib/utility.php:1166
+msgid "Integer; default 151. Allow enough for the pollers plus user logins."
+msgstr ""
+
+#: lib/utility.php:1171
+msgid "Legacy name for the open-table cache; renamed to table_open_cache."
+msgstr ""
+
+#: lib/utility.php:1172
+msgid "Integer. Use table_open_cache on modern servers."
+msgstr ""
+
+#: lib/utility.php:1177
+msgid "Maximum size of one packet or any generated/intermediate string."
+msgstr ""
+
+#: lib/utility.php:1178
+msgid "Bytes; keep at or above 16M for remote pollers."
+msgstr ""
+
+#: lib/utility.php:1183
+msgid "Maximum size to which user-created MEMORY tables may grow."
+msgstr ""
+
+#: lib/utility.php:1184
+msgid "Bytes; sized relative to total system memory."
+msgstr ""
+
+#: lib/utility.php:1189
+msgid ""
+"Maximum size of internal in-memory temporary tables before they spill to "
+"disk."
+msgstr ""
+
+#: lib/utility.php:1190
+msgid "Bytes; a larger value keeps temporary tables in memory."
+msgstr ""
+
+#: lib/utility.php:1195
+msgid "Minimum per-join buffer size for joins that do not use indexes."
+msgstr ""
+
+#: lib/utility.php:1196
+msgid "Bytes; per-connection allocation, default 262144."
+msgstr ""
+
+#: lib/utility.php:1201
+msgid "Per-session buffer allocated for sorts (ORDER BY / GROUP BY)."
+msgstr ""
+
+#: lib/utility.php:1202
+msgid "Bytes; per-connection allocation, default 2097152."
+msgstr ""
+
+#: lib/utility.php:1207
+msgid ""
+"Store each InnoDB table and its indexes in its own .ibd tablespace file."
+msgstr ""
+
+#: lib/utility.php:1208
+msgid "ON or OFF; ON is recommended."
+msgstr ""
+
+#: lib/utility.php:1213
+msgid ""
+"InnoDB on-disk file format (Antelope or Barracuda); Barracuda is now the "
+"only format."
+msgstr ""
+
+#: lib/utility.php:1214
+msgid "Antelope, Barracuda."
+msgstr ""
+
+#: lib/utility.php:1219
+msgid ""
+"Allow index key prefixes longer than 767 bytes (requires the Barracuda "
+"format)."
+msgstr ""
+
+#: lib/utility.php:1220
+msgid "ON/1 or OFF/0; this behaviour is now always enabled."
+msgstr ""
+
+#: lib/utility.php:1225
+msgid "Total memory InnoDB uses to cache table and index data."
+msgstr ""
+
+#: lib/utility.php:1226
+msgid "Bytes; commonly 25%-80% of total system memory."
+msgstr ""
+
+#: lib/utility.php:1231
+msgid ""
+"Write pages twice (the doublewrite buffer) to protect against partial page "
+"writes."
+msgstr ""
+
+#: lib/utility.php:1232
+msgid "ON or OFF."
+msgstr ""
+
+#: lib/utility.php:1237
+msgid "Legacy pool for the InnoDB internal data dictionary and structures."
+msgstr ""
+
+#: lib/utility.php:1238
+msgid "Bytes; obsolete on modern servers."
+msgstr ""
+
+#: lib/utility.php:1243
+msgid "Seconds an InnoDB transaction waits for a row lock before giving up."
+msgstr ""
+
+#: lib/utility.php:1244
+msgid "Seconds; default 50."
+msgstr ""
+
+#: lib/utility.php:1249
+msgid "Method used to flush data and log files to disk."
+msgstr ""
+
+#: lib/utility.php:1250
+msgid "O_DIRECT, fsync, O_DSYNC, and similar."
+msgstr ""
+
+#: lib/utility.php:1255
+msgid "Controls how the redo log is written and flushed at transaction commit."
+msgstr ""
+
+#: lib/utility.php:1256
+msgid "0, 1, or 2."
+msgstr ""
+
+#: lib/utility.php:1261
+msgid ""
+"Legacy single setting for InnoDB file I/O threads, replaced by the read/"
+"write I/O thread settings."
+msgstr ""
+
+#: lib/utility.php:1262
+msgid ""
+"Integer; superseded by innodb_read_io_threads and innodb_write_io_threads."
+msgstr ""
+
+#: lib/utility.php:1267
+msgid "Write and flush the InnoDB redo log every N seconds."
+msgstr ""
+
+#: lib/utility.php:1268
+msgid "Seconds (1-2700); default 1."
+msgstr ""
+
+#: lib/utility.php:1273
+msgid "Number of I/O threads used for read operations in InnoDB."
+msgstr ""
+
+#: lib/utility.php:1274 lib/utility.php:1280
+msgid "1-64; default 4."
+msgstr ""
+
+#: lib/utility.php:1279
+msgid "Number of I/O threads used for write operations in InnoDB."
+msgstr ""
+
+#: lib/utility.php:1285
+msgid "Number of regions the InnoDB buffer pool is divided into."
+msgstr ""
+
+#: lib/utility.php:1286
+msgid "1-64; MariaDB removed this in 10.6."
+msgstr ""
+
+#: lib/utility.php:1291
+msgid ""
+"Estimated I/O operations per second available to InnoDB background tasks."
+msgstr ""
+
+#: lib/utility.php:1292 lib/utility.php:1298
+msgid "Integer; use higher values for SSD/NVMe storage."
+msgstr ""
+
+#: lib/utility.php:1297
+msgid "Maximum IOPS InnoDB may use when flushing falls behind."
+msgstr ""
+
+#: lib/utility.php:1303
+msgid "Flush neighbouring dirty pages in the same extent when flushing a page."
+msgstr ""
+
+#: lib/utility.php:1304
+msgid "0, 1, or 2; use 0 on SSD storage."
+msgstr ""
+
+#: lib/utility.php:1309
+msgid ""
+"Use hardware atomic writes (MariaDB) so the doublewrite buffer can be safely "
+"disabled."
+msgstr ""
+
+#: lib/utility.php:1310
+msgid "ON or OFF; MariaDB only."
+msgstr ""
+
+#: lib/utility.php:1314
+msgid "Enforce strict snapshot isolation for InnoDB transactions."
+msgstr ""
+
+#: lib/utility.php:1315
+msgid ""
+"ON or OFF; back-ported to MariaDB 10.6.18+, 10.11.8+ and 11.4.2+. Set OFF "
+"for the Cacti poller."
+msgstr ""
+
+#: lib/utility.php:1434 lib/utility.php:1529
+msgid "Removed"
+msgstr ""
+
+#: lib/utility.php:1436 lib/utility.php:1528
+msgid "Deprecated"
+msgstr ""
+
+#: lib/utility.php:1438
+msgid "Not applicable to this engine"
+msgstr ""
+
+#: lib/utility.php:1440 lib/utility.php:1527
+msgid "Supported"
+msgstr ""
+
+#: lib/utility.php:1483
+#, php-format
+msgid "%s Variable Capability Matrix"
+msgstr ""
+
+#: lib/utility.php:1483
+msgid "Support by engine and version for each Cacti-recommended variable"
+msgstr ""
+
+#: lib/utility.php:1512
+msgid "Available settings:"
+msgstr ""
+
+#: lib/utility.php:1530
+msgid "N/A - Not applicable to this engine"
+msgstr ""
+
+#: lib/utility.php:1778 lib/utility.php:1814
+msgid ""
+"If you have SSD disks, set this to 0. Otherwise, do not set this setting."
+msgstr ""
+
 #: lib/html_filter.php
 msgid "Layouts"
 msgstr ""