TiKV config: add 7 log-related congifurations

tikv-configuration-file.md

@@ -14,7 +14,7 @@ This document only describes the parameters that are not included in command-lin
 
 ## Global configuration
 
-### abort-on-panic
+### `abort-on-panic`
 
 + Sets whether to call `abort()` to exit the process when TiKV panics. This option affects whether TiKV allows the system to generate core dump files.
 
@@ -23,7 +23,45 @@ This document only describes the parameters that are not included in command-lin
 
 + Default value: `false`
 
-### server
+### `log-level`
+
++ The log level
++ Available values: "trace", "debug", "info", "warning", "error", "critical"
++ Default value: "info"
+
+### `log-file`
+
++ The log file. If this parameter is not set, logs are written to "stderr" by default.
++ Default value: ""
+
+### `log-format`
+
++ The log format
++ Available values: "json", "text"
++ Default value: "text"
+
+### `log-rotation-timespan`
+
++ The timespan between log rotation. When this timespan passes, log files are rotated, that is, a timestamp is appended to the file name of the current log file, and a new file is created.
++ Default value: "24h"
+
+### `log-rotation-size`
+
++ The size of a log file that triggers log rotation. Once the size of a log file is bigger than the specified threshold value, log files are rotated. The old log file is placed into the new file, and the new filename is the old filename with a timestamp suffix.
++ Default value: "300MB"
+
+### `slow-log-file`
+
++ The file to store slow logs
++ If this parameter is not set but `log-file` is set, slow logs are written to the log file that specified in `log-file`. If both `slow-log-file` and `log-file` are not set, all logs are output to "stderr".
++ Default value: ""
+
+### `slow-log-threshold`
+
++ The threshold to print slow logs. If the process time is longer than this threshold, the slow logs are printed.
++ Default value: "1s"
+
+## server
 
 + Configuration items related to the server
 
@@ -116,7 +154,7 @@ This document only describes the parameters that are not included in command-lin
 
 ### `end-point-slow-log-threshold`
 
-+ The time threshold for a TiDB's push down request to print slow log
++ The time threshold for a TiDB's push down request to print slow log. If the process time is longer than this threshold, the slow logs are printed.
 + Default value: `"1s"`
 + Minimum value: `0`