retention policy:
1s:2d
1m:28d
1h:2y
+-----------------------------------+
| metric_header (63) |
+-----------------------------------+
| archive_0_header (96) |
+-----------------------------------+
| archive_1_header (96) |
+-----------------------------------+
| archive_2_header (96) |
+-----------------------------------+
| archive_0_index |
| +-----------------------------+ |
| | archive_0_block_0_info (16) | |
| +-----------------------------+ |
| | archive_0_block_1_info (16) | |
| +-----------------------------+ |
| | ... | |
| +-----------------------------+ |
| |archive_0_block_23_info (16) | |
| +-----------------------------+ |
| | archive_0_buffer (120) | |
| +-----------------------------+ |
+-----------------------------------+
| archive_1_index |
| +-----------------------------+ |
| | archive_1_block_0_info (16) | |
| +-----------------------------+ |
| | archive_1_block_1_info (16) | |
| +-----------------------------+ |
| | ... | |
| +-----------------------------+ |
| | archive_1_block_5_info (16) | |
| +-----------------------------+ |
| | archive_1_buffer (120) | |
| +-----------------------------+ |
+-----------------------------------+
| archive_2_index |
| +-----------------------------+ |
| | archive_2_block_0_info (16) | |
| +-----------------------------+ |
| | archive_2_block_1_info (16) | |
| +-----------------------------+ |
| | archive_2_block_3_info (16) | |
| +-----------------------------+ |
+-----------------------------------+
| archive_0_data |
| +-----------------------------+ |
| | archive_0_block_0 (14400) | |
| +-----------------------------+ |
| | archive_0_block_1 (14400) | |
| +-----------------------------+ |
| | ... | |
| +-----------------------------+ |
| | archive_0_block_23 (14400) | |
| +-----------------------------+ |
+-----------------------------------+
| archive_1_data |
| +-----------------------------+ |
| | archive_1_block_0 (14400) | |
| +-----------------------------+ |
| | archive_1_block_1 (14400) | |
| +-----------------------------+ |
| | ... | |
| +-----------------------------+ |
| | archive_1_block_5 (14400) | |
| +-----------------------------+ |
+-----------------------------------+
| archive_2_data |
| +-----------------------------+ |
| | archive_2_block_0 (14400) | |
| +-----------------------------+ |
| | archive_2_block_1 (14400) | |
| +-----------------------------+ |
| | archive_2_block_3 (14400) | |
| +-----------------------------+ |
+-----------------------------------+