Memcached
Memcached 采集器可以从 Memcached 实例中采集实例运行状态指标，并将指标采集到观测云，帮助监控分析 Memcached 各种异常情况。
配置¶
前置条件¶
- Memcached 版本 >=
1.5.0。已测试的版本：- 1.5.x
- 1.6.x
进入 DataKit 安装目录下的 conf.d/samples 目录，复制 memcached.conf.sample 并命名为 memcached.conf。示例如下：
[[inputs.memcached]]
## Servers' addresses.
servers = ["localhost:11211"]
# unix_sockets = ["/var/run/memcached.sock"]
## Set true to enable election
election = true
## Collect extra stats
# extra_stats = ["slabs", "items"]
## Collect interval.
# units: "ns", "us", "ms", "s", "m", "h"
interval = "10s"
[inputs.memcached.tags]
# some_tag = "some_value"
# more_tag = "some_other_value"
# ...
配置好后，重启 DataKit 即可。
目前可以通过 ConfigMap 方式注入采集器配置来开启采集器。
指标¶
以下所有数据采集，默认会追加全局选举 tag，也可以在配置中通过 [inputs.memcached.tags] 指定其它标签：
memcached¶
| Tags & Fields | Description |
|---|---|
| server ( tag) |
The host name from which metrics are gathered |
| accepting_conns | Whether or not server is accepting conns Type: int | (gauge) Unit: count |
| auth_cmds | Number of authentication commands handled, success or failure Type: int | (gauge) Unit: count |
| auth_errors | Number of failed authentications Type: int | (gauge) Unit: count |
| bytes | Current number of bytes used to store items Type: int | (gauge) Unit: digital,B |
| bytes_read | Total number of bytes read by this server from network Type: int | (gauge) Unit: digital,B |
| bytes_written | Total number of bytes sent by this server to network Type: int | (gauge) Unit: digital,B |
| cas_badval | Number of CAS for which a key was found, but the CAS value did not match Type: int | (gauge) Unit: count |
| cas_hits | Number of successful CAS requests Type: int | (gauge) Unit: count |
| cas_misses | Number of CAS requests against missing keys Type: int | (gauge) Unit: count |
| cmd_flush | Cumulative number of flush requests Type: int | (gauge) Unit: count |
| cmd_get | Cumulative number of retrieval requests Type: int | (gauge) Unit: count |
| cmd_set | Cumulative number of storage requests Type: int | (gauge) Unit: count |
| cmd_touch | Cumulative number of touch requests Type: int | (gauge) Unit: count |
| conn_yields | Number of times any connection yielded to another due to hitting the -R limit Type: int | (gauge) Unit: count |
| connection_structures | Number of connection structures allocated by the server Type: int | (gauge) Unit: count |
| curr_connections | Number of open connections Type: int | (gauge) Unit: count |
| curr_items | Current number of items stored Type: int | (gauge) Unit: count |
| decr_hits | Number of successful decr requestsType: int | (gauge) Unit: count |
| decr_misses | Number of decr requests against missing keysType: int | (gauge) Unit: count |
| delete_hits | Number of deletion requests resulting in an item being removed Type: int | (gauge) Unit: count |
| delete_misses | umber of deletions requests for missing keys Type: int | (gauge) Unit: count |
| evicted_unfetched | Items evicted from LRU that were never touched by get/incr/append/etc Type: int | (gauge) Unit: count |
| evictions | Number of valid items removed from cache to free memory for new items Type: int | (gauge) Unit: count |
| expired_unfetched | Items pulled from LRU that were never touched by get/incr/append/etc before expiring Type: int | (gauge) Unit: count |
| get_hits | Number of keys that have been requested and found present Type: int | (gauge) Unit: count |
| get_misses | Number of items that have been requested and not found Type: int | (gauge) Unit: count |
| hash_bytes | Bytes currently used by hash tables Type: int | (gauge) Unit: digital,B |
| hash_is_expanding | Indicates if the hash table is being grown to a new size Type: int | (gauge) Unit: count |
| hash_power_level | Current size multiplier for hash table Type: int | (gauge) Unit: count |
| incr_hits | Number of successful incr requests Type: int | (gauge) Unit: count |
| incr_misses | Number of incr requests against missing keys Type: int | (gauge) Unit: count |
| limit_maxbytes | Number of bytes this server is allowed to use for storage Type: int | (gauge) Unit: digital,B |
| listen_disabled_num | Number of times server has stopped accepting new connections (maxconns)Type: int | (gauge) Unit: count |
| reclaimed | Number of times an entry was stored using memory from an expired entry Type: int | (gauge) Unit: count |
| threads | Number of worker threads requested Type: int | (gauge) Unit: count |
| total_connections | Total number of connections opened since the server started running Type: int | (gauge) Unit: count |
| total_items | Total number of items stored since the server started Type: int | (gauge) Unit: count |
| touch_hits | Number of keys that have been touched with a new expiration time Type: int | (gauge) Unit: count |
| touch_misses | Number of items that have been touched and not found Type: int | (gauge) Unit: count |
| uptime | Number of secs since the server started Type: int | (gauge) Unit: count |
memcached_items¶
| Tags & Fields | Description |
|---|---|
| server ( tag) |
The host name from which metrics are gathered |
| slab_id ( tag) |
The id of the current slab |
| age | Age of the oldest item in the LRU Type: int | (gauge) Unit: count |
| crawler_reclaimed | Number of items which freed by the LRU Crawler Type: int | (gauge) Unit: count |
| direct_reclaims | Number of worker threads which had to directly pull LRU tails to find memory for a new item Type: int | (gauge) Unit: count |
| evicted | Number of the items which had to be evicted from the LRU before expiring Type: int | (gauge) Unit: count |
| evicted_nonzero | Number of the onzero items which had an explicit expire time set had to be evicted from the LRU before expiringType: int | (gauge) Unit: count |
| evicted_time | Seconds since the last access for the most recent item evicted from this class Type: int | (gauge) Unit: time,s |
| evicted_unfetched | Number of the valid items evicted from the LRU which were never touched after being set Type: int | (gauge) Unit: count |
| expired_unfetched | Number of the expired items reclaimed from the LRU which were never touched after being set Type: int | (gauge) Unit: count |
| lrutail_reflocked | Number of items which found to be refcount locked in the LRU tailType: int | (gauge) Unit: count |
| moves_to_cold | Number of items which were moved from HOT or WARM into COLD Type: int | (gauge) Unit: count |
| moves_to_warm | Number of items which were moved from COLD to WARM Type: int | (gauge) Unit: count |
| moves_within_lru | Number of active items which were bumped within HOT or WARM Type: int | (gauge) Unit: count |
| number | Number of items presently stored in this slab class Type: int | (gauge) Unit: count |
| number_cold | Number of items presently stored in the COLD LRU Type: int | (gauge) Unit: count |
| number_hot | Number of items presently stored in the HOT LRU Type: int | (gauge) Unit: count |
| number_noexp | Number of items presently stored in the NOEXP classType: int | (gauge) Unit: count |
| number_warm | Number of items presently stored in the WARM LRU Type: int | (gauge) Unit: count |
| outofmemory | Number of the underlying slab class which was unable to store a new item Type: int | (gauge) Unit: count |
| reclaimed | Number of entries which were stored using memory from an expired entry Type: int | (gauge) Unit: count |
| tailrepairs | How many times memcache self-healed a slab with a refcount leakType: int | (gauge) Unit: count |
memcached_slabs¶
| Tags & Fields | Description |
|---|---|
| server ( tag) |
The host name from which metrics are gathered |
| slab_id ( tag) |
The id of the current slab |
| active_slabs | Total number of slab classes allocated Type: int | (gauge) Unit: count |
| cas_badval | Number of CAS commands failed to modify a value due to a bad CAS id Type: int | (gauge) Unit: count |
| cas_hits | Number of CAS commands modified this slab class Type: int | (gauge) Unit: count |
| chunk_size | The amount of space each chunk uses Type: int | (gauge) Unit: digital,B |
| chunks_per_page | How many chunks exist within one page Type: int | (gauge) Unit: count |
| cmd_set | Number of set requests stored data in this slab class Type: int | (gauge) Unit: count |
| decr_hits | Number of decrs commands modified this slab classType: int | (gauge) Unit: count |
| delete_hits | Number of delete commands succeeded in this slab class Type: int | (gauge) Unit: count |
| free_chunks | Chunks not yet allocated to items or freed via delete Type: int | (gauge) Unit: count |
| free_chunks_end | Number of free chunks at the end of the last allocated page Type: int | (gauge) Unit: count |
| get_hits | Number of get requests were serviced by this slab class Type: int | (gauge) Unit: count |
| incr_hits | Number of incrs commands modified this slab classType: int | (gauge) Unit: count |
| total_chunks | Total number of chunks allocated to the slab class Type: int | (gauge) Unit: count |
| total_malloced | Total amount of memory allocated to slab pages Type: int | (gauge) Unit: digital,B |
| total_pages | Total number of pages allocated to the slab class Type: int | (gauge) Unit: count |
| touch_hits | Number of touches serviced by this slab class Type: int | (gauge) Unit: count |
| used_chunks | How many chunks have been allocated to items Type: int | (gauge) Unit: count |