Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/inputs/kernel/README.md

@@ -0,0 +1,115 @@
+# Kernel Input Plugin
+
+This plugin gathers metrics about the [Linux kernel][kernel] including, among
+others, the [available entropy][entropy], [Kernel Samepage Merging][ksm] and
+[Pressure Stall Information][psi].
+
+⭐ Telegraf v0.11.0
+🏷️ system
+💻 linux
+
+[kernel]: https://kernel.org/
+[entropy]: https://www.kernel.org/doc/html/latest/admin-guide/sysctl/kernel.html#random
+[ksm]: https://www.kernel.org/doc/html/latest/mm/ksm.html
+[psi]: https://www.kernel.org/doc/html/latest/accounting/psi.html
+
+## Global configuration options <!-- @/docs/includes/plugin_config.md -->
+
+In addition to the plugin-specific configuration settings, plugins support
+additional global and plugin configuration settings. These settings are used to
+modify metrics, tags, and field or create aliases and configure ordering, etc.
+See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
+
+[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
+
+## Configuration
+
+```toml @sample.conf
+# Plugin to collect various Linux kernel statistics.
+# This plugin ONLY supports Linux
+[[inputs.kernel]]
+  ## Additional gather options
+  ## Possible options include:
+  ## * ksm - kernel same-page merging
+  ## * psi - pressure stall information
+  # collect = []
+```
+
+Please check the documentation of the underlying kernel interfaces in the
+`/proc/stat` section of the [proc man page][man_proc], as well as in the
+`/proc interfaces` section of the [random man page][man_random].
+
+Kernel Samepage Merging is generally documented in the
+[kernel documentation][ksm] and the available metrics exposed via sysfs
+are documented in the [admin guide][ksm_admin].
+
+Pressure Stall Information is exposed through `/proc/pressure` and is documented
+in [kernel documentation][psi]. Kernel version 4.20+ is required.
+
+[ksm_admin]: https://www.kernel.org/doc/html/latest/admin-guide/mm/ksm.html#ksm-daemon-sysfs-interface
+[man_proc]: http://man7.org/linux/man-pages/man5/proc.5.html
+[man_random]: https://man7.org/linux/man-pages/man4/random.4.html
+
+## Metrics
+
+- kernel
+  - boot_time (integer, seconds since epoch, `btime`)
+  - context_switches (integer, `ctxt`)
+  - disk_pages_in (integer, `page (0)`)
+  - disk_pages_out (integer, `page (1)`)
+  - interrupts (integer, `intr`)
+  - processes_forked (integer, `processes`)
+  - entropy_avail (integer, `entropy_available`)
+  - ksm_full_scans (integer, how many times all mergeable areas have been scanned, `full_scans`)
+  - ksm_max_page_sharing (integer, maximum sharing allowed for each KSM page, `max_page_sharing`)
+  - ksm_merge_across_nodes (integer, whether pages should be merged across NUMA nodes, `merge_across_nodes`)
+  - ksm_pages_shared (integer, how many shared pages are being used, `pages_shared`)
+  - ksm_pages_sharing (integer,how many more sites are sharing them , `pages_sharing`)
+  - ksm_pages_to_scan (integer, how many pages to scan before ksmd goes to sleep, `pages_to_scan`)
+  - ksm_pages_unshared (integer, how many pages unique but repeatedly checked for merging, `pages_unshared`)
+  - ksm_pages_volatile (integer, how many pages changing too fast to be placed in a tree, `pages_volatile`)
+  - ksm_run (integer, whether ksm is running or not, `run`)
+  - ksm_sleep_millisecs (integer, how many milliseconds ksmd should sleep between scans, `sleep_millisecs`)
+  - ksm_stable_node_chains (integer, the number of KSM pages that hit the max_page_sharing limit, `stable_node_chains`)
+  - ksm_stable_node_chains_prune_millisecs (integer, how frequently KSM checks the metadata of the pages that hit the deduplication limit, `stable_node_chains_prune_millisecs`)
+  - ksm_stable_node_dups (integer, number of duplicated KSM pages, `stable_node_dups`)
+  - ksm_use_zero_pages (integer, whether empty pages should be treated specially, `use_zero_pages`)
+
+- pressure (if `psi` is included in `collect`)
+  - tags:
+    - resource: cpu, memory, or io
+    - type: some or full
+  - floating-point fields: avg10, avg60, avg300
+  - integer fields: total
+
+## Example Output
+
+Default config:
+
+```text
+kernel boot_time=1690487872i,context_switches=321398652i,entropy_avail=256i,interrupts=141868628i,processes_forked=946492i 1691339564000000000
+```
+
+If `ksm` is included in `collect`:
+
+```text
+kernel boot_time=1690487872i,context_switches=321252729i,entropy_avail=256i,interrupts=141783427i,ksm_full_scans=0i,ksm_max_page_sharing=256i,ksm_merge_across_nodes=1i,ksm_pages_shared=0i,ksm_pages_sharing=0i,ksm_pages_to_scan=100i,ksm_pages_unshared=0i,ksm_pages_volatile=0i,ksm_run=0i,ksm_sleep_millisecs=20i,ksm_stable_node_chains=0i,ksm_stable_node_chains_prune_millisecs=2000i,ksm_stable_node_dups=0i,ksm_use_zero_pages=0i,processes_forked=946467i 1691339522000000000
+```
+
+If `psi` is included in `collect`:
+
+```text
+pressure,resource=cpu,type=some avg10=1.53,avg60=1.87,avg300=1.73 1700000000000000000
+pressure,resource=memory,type=some avg10=0.00,avg60=0.00,avg300=0.00 1700000000000000000
+pressure,resource=memory,type=full avg10=0.00,avg60=0.00,avg300=0.00 1700000000000000000
+pressure,resource=io,type=some avg10=0.0,avg60=0.0,avg300=0.0 1700000000000000000
+pressure,resource=io,type=full avg10=0.0,avg60=0.0,avg300=0.0 1700000000000000000
+pressure,resource=cpu,type=some total=1088168194i 1700000000000000000
+pressure,resource=memory,type=some total=3463792i 1700000000000000000
+pressure,resource=memory,type=full total=1429641i 1700000000000000000
+pressure,resource=io,type=some total=68568296i 1700000000000000000
+pressure,resource=io,type=full total=54982338i 1700000000000000000
+```
+
+Note that the combination for `resource=cpu,type=full` is omitted because it is
+always zero.