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Memcached plugin addtional metrics to collect added #4914

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Oct 24, 2018
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Memcached plugin addtional metrics to collect added #4914

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49 changes: 32 additions & 17 deletions plugins/inputs/memcached/README.md
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Expand Up @@ -20,31 +20,46 @@ The fields from this plugin are gathered in the *memcached* measurement.

Fields:

* get_hits - Number of keys that have been requested and found present
* get_misses - Number of items that have been requested and not found
* evictions - Number of valid items removed from cache to free memory for new items
* limit_maxbytes - Number of bytes this server is allowed to use for storage
* accepting_conns - Whether or not server is accepting conns
* auth_cmds - Number of authentication commands handled, success or failure
* auth_errors - Number of failed authentications
* bytes - Current number of bytes used to store items
* uptime - Number of secs since the server started
* curr_items - Current number of items stored
* total_items - Total number of items stored since the server started
* curr_connections - Number of open connections
* total_connections - Total number of connections opened since the server started running
* connection_structures - Number of connection structures allocated by the server
* bytes_read - Total number of bytes read by this server from network
* bytes_written - Total number of bytes sent by this server to network
* cas_badval - Number of CAS reqs for which a key was found, but the CAS value did not match
* cas_hits - Number of successful CAS reqs
* cas_misses - Number of CAS reqs against missing keys
* cmd_flush - Cumulative number of flush reqs
* cmd_get - Cumulative number of retrieval reqs
* cmd_set - Cumulative number of storage reqs
* cmd_touch - Cumulative number of touch reqs
* conn_yields - Number of times any connection yielded to another due to hitting the -R limit
* connection_structures - Number of connection structures allocated by the server
* curr_connections - Number of open connections
* curr_items - Current number of items stored
* decr_hits - Number of successful decr reqs
* decr_misses - Number of decr reqs against missing keys
* delete_hits - Number of deletion reqs resulting in an item being removed
* delete_misses - umber of deletions reqs for missing keys
* evicted_unfetched - Items evicted from LRU that were never touched by get/incr/append/etc
* evictions - Number of valid items removed from cache to free memory for new items
* expired_unfetched - Items pulled from LRU that were never touched by get/incr/append/etc before expiring
* get_hits - Number of keys that have been requested and found present
* get_misses - Number of items that have been requested and not found
* hash_bytes - Bytes currently used by hash tables
* hash_is_expanding - Indicates if the hash table is being grown to a new size
* hash_power_level - Current size multiplier for hash table
* incr_hits - Number of successful incr reqs
* incr_misses - Number of incr reqs against missing keys
* decr_hits - Number of successful decr reqs
* decr_misses - Number of decr reqs against missing keys
* cas_hits - Number of successful CAS reqs
* cas_misses - Number of CAS reqs against missing keys
* bytes_read - Total number of bytes read by this server from network
* bytes_written - Total number of bytes sent by this server to network
* limit_maxbytes - Number of bytes this server is allowed to use for storage
* listen_disabled_num - Number of times server has stopped accepting new connections (maxconns)
* reclaimed - Number of times an entry was stored using memory from an expired entry
* threads - Number of worker threads requested
* conn_yields - Number of times any connection yielded to another due to hitting the -R limit
* total_connections - Total number of connections opened since the server started running
* total_items - Total number of items stored since the server started
* touch_hits - Number of keys that have been touched with a new expiration time
* touch_misses - Number of items that have been touched and not found
* uptime - Number of secs since the server started

Description of gathered fields taken from [here](https://github.com/memcached/memcached/blob/master/doc/protocol.txt).

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49 changes: 32 additions & 17 deletions plugins/inputs/memcached/memcached.go
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Expand Up @@ -29,31 +29,46 @@ var defaultTimeout = 5 * time.Second

// The list of metrics that should be sent
var sendMetrics = []string{
"get_hits",
"get_misses",
"evictions",
"limit_maxbytes",
"accepting_conns",
"auth_cmds",
"auth_errors",
"bytes",
"uptime",
"curr_items",
"total_items",
"curr_connections",
"total_connections",
"connection_structures",
"bytes_read",
"bytes_written",
"cas_badval",
"cas_hits",
"cas_misses",
"cmd_flush",
"cmd_get",
"cmd_set",
"cmd_touch",
"conn_yields",
"connection_structures",
"curr_connections",
"curr_items",
"decr_hits",
"decr_misses",
"delete_hits",
"delete_misses",
"evicted_unfetched",
"evictions",
"expired_unfetched",
"get_hits",
"get_misses",
"hash_bytes",
"hash_is_expanding",
"hash_power_level",
"incr_hits",
"incr_misses",
"decr_hits",
"decr_misses",
"cas_hits",
"cas_misses",
"bytes_read",
"bytes_written",
"limit_maxbytes",
"listen_disabled_num",
"reclaimed",
"threads",
"conn_yields",
"total_connections",
"total_items",
"touch_hits",
"touch_misses",
"uptime",
}

// SampleConfig returns sample configuration message
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