From collectd Wiki

The v5 upgrade target can be used to upgrade version 4 data to a changed version 5 layout. For example, it ensures that the interface name is assigned to the plugin instance rather than the type instance and converts the df type to the df_complex type.

Synopsis

<Chain "PreCache">
   Target "v5upgrade"
</Chain>

Implemented upgrades

Df type

Convert the df type to the df_complex type:

df	→	df_complex-used
		df_complex-free

Interface plugin

Ensure the interface name is assigned to the plugin instance, not the type instance.

Mysql_qcache type

Convert the mysql_qcache type to the cache_result and cache_size types:

mysql_qcache	→	cache_result-qcache-hits
		cache_result-qcache-inserts
		cache_result-qcache-not_cached
		cache_result-qcache-prunes
		cache_size-qcache

Mysql_threads type

Convert the mysql_threads type to the threads and total_threads types:

mysql_threads	→	threads-running
		threads-connected
		threads-cached
		total_threads-created

Arc_counts type

Convert the arc_counts type to the cache_result type:

arc_counts-(hits/misses)	→	cache_result-demand_data-(hit/miss)
		cache_result-demand_metadata-(hit/miss)
		cache_result-prefetch_data-(hit/miss)
		cache_result-prefetch_metadata-(hit/miss)

Arc_l2_bytes type

Convert the arc_l2_bytes type to the io_octets type:

arc_l2_bytes → io_octets-L2

Arc_l2_size type

Convert the arc_l2_size type to the cache_size type:

arc_l2_size → cache_size-L2

Arc_ratio type

Convert the arc_ratio type to the cache_ratio type. Adapt the type instance “L1” to “arc”.

arc_ratio-L1 → cache_ratio-arc

arc_ratio-L2 → cache_ratio-L2

Arc_size type

Convert the arc_size type to the cache_size type. Only the data source “current” is converted, the other three data sources represent static configuration settings and will be omitted.

arc_size (current) → cache_size-arc

Dependencies

• none