For example, if 2 days are configured for a 5-minute instance, the lifecycle is set as a 5-minute data monitoring instance by default. Data of the last two days is stored in the database; other data is automatically dumped to files or deleted.
If the period from 1st April 2019 to 30th April 2019 is saved on 30th April 2019, the life cycle is 31 days (1 month from 1st April to 30th April).
If the period from 1st April 2019 to 30th April 2019 is saved on 30th May 2019, the life cycle is 62 days (2 months from 1st April to 30th May).
You can refer to the Chapter 5 in the below link:
Please take note: the 5-minute data monitoring instance is set by default as 2 days.
For example, you change the Lifecycle (day) to 62 days for the 5 minute-granularity on 3rd April 2019. The system starts to save the data from the day you expanded; thus the older data cannot be found.
For example, on 3rd April, assuming that the lifecycle you've set before is 2 days, your data from before 1st April is deleted. And now you've changed to 62 days and the data for 1st April is gone and you can't find it. When you change to 62, at that moment the data collected later can be saved for 62 days.
