diff --git a/ENVIRONMENT.md b/ENVIRONMENT.md
index c9b78a2..68dbf46 100644
--- a/ENVIRONMENT.md
+++ b/ENVIRONMENT.md
@@ -165,6 +165,8 @@
   Define additional login buttons on the logon screen (see [documentation](https://doc.owncloud.com/server/latest/admin_manual/configuration/server/config_sample_php_parameters.html#define-additional-login-buttons-on-the-logon-screen)).
 - `OWNCLOUD_LOGIN_POLICY_ORDER=` \
   Ordered list of login policy class names. Comma-separated (see [documentation](https://doc.owncloud.com/server/latest/admin_manual/configuration/server/config_sample_php_parameters.html#define-additional-login-buttons-on-the-logon-screen)).
+- `OWNCLOUD_LOG_CONDITIONS=` \
+  Define conditional logging rules as a JSON-encoded array of condition objects, e.g. `[{"apps":["files_external"],"loglevel":0}]` (see [documentation](https://doc.owncloud.com/server/latest/admin_manual/configuration/server/config_sample_php_parameters.html#define-log-conditions)).
 - `OWNCLOUD_LOG_DATE_FORMAT=` \
   Define the log date format (see [documentation](https://doc.owncloud.com/server/latest/admin_manual/configuration/server/config_sample_php_parameters.html#define-the-log-date-format)).
 - `OWNCLOUD_LOG_FILE=${OWNCLOUD_VOLUME_FILES}/owncloud.log` \
diff --git a/v20.04/overlay/etc/templates/config.php b/v20.04/overlay/etc/templates/config.php
index 2d81903..d2730f5 100644
--- a/v20.04/overlay/etc/templates/config.php
+++ b/v20.04/overlay/etc/templates/config.php
@@ -253,6 +253,18 @@ function getConfigFromEnv() {
     $config['log_rotate_size'] = (int) getenv('OWNCLOUD_LOG_ROTATE_SIZE');
   }
 
+  // 'log.conditions' is a list of condition maps with mixed scalar/array
+  // values (apps, users, logfile, loglevel, shared_secret), which the flat
+  // env-var idioms used elsewhere here cannot represent. It is therefore
+  // passed as a JSON-encoded array, e.g.:
+  //   OWNCLOUD_LOG_CONDITIONS='[{"apps":["files_external"],"loglevel":0}]'
+  if (getenv('OWNCLOUD_LOG_CONDITIONS') != '') {
+    $logConditions = json_decode(getenv('OWNCLOUD_LOG_CONDITIONS'), true);
+    if (is_array($logConditions)) {
+      $config['log.conditions'] = $logConditions;
+    }
+  }
+
   if (getenv('OWNCLOUD_ENABLE_PREVIEWS') != '') {
     $config['enable_previews'] = getenv('OWNCLOUD_ENABLE_PREVIEWS') === 'true';
   }
diff --git a/v22.04/overlay/etc/templates/config.php b/v22.04/overlay/etc/templates/config.php
index 2d81903..d2730f5 100644
--- a/v22.04/overlay/etc/templates/config.php
+++ b/v22.04/overlay/etc/templates/config.php
@@ -253,6 +253,18 @@ function getConfigFromEnv() {
     $config['log_rotate_size'] = (int) getenv('OWNCLOUD_LOG_ROTATE_SIZE');
   }
 
+  // 'log.conditions' is a list of condition maps with mixed scalar/array
+  // values (apps, users, logfile, loglevel, shared_secret), which the flat
+  // env-var idioms used elsewhere here cannot represent. It is therefore
+  // passed as a JSON-encoded array, e.g.:
+  //   OWNCLOUD_LOG_CONDITIONS='[{"apps":["files_external"],"loglevel":0}]'
+  if (getenv('OWNCLOUD_LOG_CONDITIONS') != '') {
+    $logConditions = json_decode(getenv('OWNCLOUD_LOG_CONDITIONS'), true);
+    if (is_array($logConditions)) {
+      $config['log.conditions'] = $logConditions;
+    }
+  }
+
   if (getenv('OWNCLOUD_ENABLE_PREVIEWS') != '') {
     $config['enable_previews'] = getenv('OWNCLOUD_ENABLE_PREVIEWS') === 'true';
   }
diff --git a/v24.04/overlay/etc/templates/config.php b/v24.04/overlay/etc/templates/config.php
index 7622cfd..fe38444 100644
--- a/v24.04/overlay/etc/templates/config.php
+++ b/v24.04/overlay/etc/templates/config.php
@@ -306,6 +306,18 @@ function getConfigFromEnv() {
     $config['log_rotate_size'] = (int) getenv('OWNCLOUD_LOG_ROTATE_SIZE');
   }
 
+  // 'log.conditions' is a list of condition maps with mixed scalar/array
+  // values (apps, users, logfile, loglevel, shared_secret), which the flat
+  // env-var idioms used elsewhere here cannot represent. It is therefore
+  // passed as a JSON-encoded array, e.g.:
+  //   OWNCLOUD_LOG_CONDITIONS='[{"apps":["files_external"],"loglevel":0}]'
+  if (getenv('OWNCLOUD_LOG_CONDITIONS') != '') {
+    $logConditions = json_decode(getenv('OWNCLOUD_LOG_CONDITIONS'), true);
+    if (is_array($logConditions)) {
+      $config['log.conditions'] = $logConditions;
+    }
+  }
+
   if (getenv('OWNCLOUD_ENABLE_PREVIEWS') != '') {
     $config['enable_previews'] = getenv('OWNCLOUD_ENABLE_PREVIEWS') === 'true';
   }