| This graph shows what the machine uses its memory for. | |||||
| Field | Internal name | Type | Warn | Crit | |
|---|---|---|---|---|---|
| cache | cached | gauge | None | None | Parked file data (file content) cache. |
| swap_cache | swap_cache | gauge | None | None | A piece of memory that keeps track of pages that have been fetched from swap but not yet been modified. |
| mapped | mapped | gauge | None | None | All mmap()ed pages. |
| apps | apps | gauge | None | None | Memory used by user-space applications. |
| swap | swap | gauge | None | None | Swap space used. |
| unused | free | gauge | None | None | Wasted memory. Memory that is not used for anything at all. |
| active | active | gauge | None | None | Memory recently used. Not reclaimed unless absolutely necessary. |
| committed | committed | gauge | None | None | The amount of memory that would be used if all the memory that's been allocated were to be used. |
| inactive | inactive | gauge | None | None | Memory not currently used. |
| vmalloc_used | vmalloc_used | gauge | None | None | Virtual memory used by the kernel (used when the memory does not have to be physically contigious). |
| slab_cache | slab | gauge | None | None | Memory used by the kernel (major users are caches like inode, dentry, etc). |
| page_tables | page_tables | gauge | None | None | Memory used to map between virtual and physical memory addresses. |
| buffers | buffers | gauge | None | None | Block device (e.g. harddisk) cache. Also where "dirty" blocks are stored until written. |