graylog_indices配置

1.在导航栏System/Indices -> Create Index set,创建一个新索引;

2.Select rotation strategy选择Index Time（按时间进行轮转），Rotation period 轮转的时间为P10D（D代表天，H代表小时，M代表月）;

3.我们再往下进行定义Index的清理、保留策略。我们选择Select retention strategy 为Delete Index（删除索引），Max number of indices 选择3个。给大家解释一下就是4xx_5xx_log这个索引只保留3个，也就是3x10D，一个月的日志，点击save保存;

ISO 8601 Durations are expressed using the following format, where (n) is replaced by the value for each of the date and time elements that follow the (n):

P(n)Y(n)M(n)DT(n)H(n)M(n)S

Where:

P is the duration designator (referred to as "period"), and is always placed at the beginning of the duration.

Y is the year designator that follows the value for the number of years.

M is the month designator that follows the value for the number of months.

W is the week designator that follows the value for the number of weeks.

D is the day designator that follows the value for the number of days.

T is the time designator that precedes the time components.

H is the hour designator that follows the value for the number of hours.

M is the minute designator that follows the value for the number of minutes.

S is the second designator that follows the value for the number of seconds.

Terminateddisk平均等待时间是持续时间指示器(称为“period”)，并且总是放在持续时间的开头。  

Y是年份指示器，跟随年份数的值。  

M是月份指示器，它跟在月份数的值之后。  

W是周指示符，它跟在表示周数的值之后。  

D是日期指示器，它跟在表示天数的值之后。  

T是时间指示符，在时间分量之前。  

H是小时指示器，紧跟在小时数的值之后。  

M是分钟指示器，它跟在分钟数的值之后。  

S是秒数值后面的第二个指示符。 

For example:

P3Y6M4DT12H30M5S

Represents a duration of three years, six months, four days, twelve hours, thirty minutes, and five seconds.

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