Merge pull request #4122 from vespa-engine/bjormel/rotate-access-log-on-size

Rotate access log if larger than configured limit

Author: bjormel

en/access-logging.html

@@ -112,6 +112,16 @@ <h2 id="configuring-logging">Configuring Logging</h2>
 For details on the access logging configuration see <a href="reference/services-container.html#accesslog">
 accesslog in the container</a> element in <em>services.xml</em>.
 </p>
+<p>
+Key configuration options include:
+</p>
+<ul>
+  <li><strong>fileNamePattern</strong>: Pattern for log file names with time variable support</li>
+  <li><strong>rotationInterval</strong>: Time-based rotation schedule (minutes since midnight)</li>
+  <li><strong>rotationSize</strong>: Size-based rotation threshold in bytes (0 = disabled)</li>
+  <li><strong>rotationScheme</strong>: Either 'sequence' or 'date'</li>
+  <li><strong>compressionFormat</strong>: GZIP or ZSTD compression for rotated files</li>
+</ul>
 
 <h3 id="logging-request-content">Logging Request Content</h3>
 <p>
@@ -186,7 +196,7 @@ <h2 id="log-rotation">Log rotation</h2>
 <p>
   Apache httpd style log <em>rotation</em> can be configured by setting the <em>rotationScheme</em>.
   There's two alternatives for the rotationScheme, sequence and date.
-  The rotation time is controlled by setting <em>rotationInterval</em>.
+  Rotation can be triggered by time intervals using <em>rotationInterval</em> and/or by file size using <em>rotationSize</em>.
 </p>
 
 
@@ -241,7 +251,6 @@ <h3 id="rotation-interval">Rotation interval</h3>
   E.g. "0 100 240 480 ..." is expanded to "0 100 240 480 720 960 1200"
 </p>
 
-
 <h3 id="log-retention">Log retention</h3>
 <p>
   Access logs are rotated, but not deleted by Vespa processes.