Add cache, rows stats and connection errors data to status metricset …

…in MySQL module (elastic#19844)

CHANGELOG.next.asciidoc

@@ -570,6 +570,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Added `performance` and `query` metricsets to `mysql` module. {pull}18955[18955]
 - The `elasticsearch-xpack/index` metricset now reports hidden indices as such. {issue}18639[18639] {pull}18706[18706]
 - Adds support for app insights metrics in the azure module. {issue}18570[18570] {pull}18940[18940]
+- Added cache and connection_errors metrics to status metricset of MySQL module {issue}16955[16955] {pull}19844[19844]
 
 *Packetbeat*
 

metricbeat/docs/fields.asciidoc

@@ -32345,6 +32345,153 @@ type: long
 The number of failed attempts to connect to the MySQL server.
 
 
+type: long
+
+--
+
+[float]
+=== connection
+
+
+
+
+[float]
+=== errors
+
+
+
+
+*`mysql.status.connection.errors.peer_address`*::
++
+--
+The number of errors that occurred while searching for connecting client IP addresses.
+
+type: long
+
+--
+
+*`mysql.status.connection.errors.accept`*::
++
+--
+The number of errors that occurred during calls to accept() on the listening port.
+
+type: long
+
+--
+
+*`mysql.status.connection.errors.internal`*::
++
+--
+The number of connections refused due to internal errors in the server, such as failure to start a new thread or an out-of-memory condition.
+
+
+type: long
+
+--
+
+*`mysql.status.connection.errors.max`*::
++
+--
+The number of connections refused because the server max_connections limit was reached. thread or an out-of-memory condition.
+
+type: long
+
+--
+
+*`mysql.status.connection.errors.tcpwrap`*::
++
+--
+The number of connections refused by the libwrap library.
+
+type: long
+
+--
+
+*`mysql.status.connection.errors.select`*::
++
+--
+The number of errors that occurred during calls to select() or poll() on the listening port. (Failure of this operation does not necessarily means a client connection was rejected.)
+
+
+type: long
+
+--
+
+[float]
+=== cache
+
+
+
+
+[float]
+=== ssl
+
+SSL session cache hits and misses.
+
+
+*`mysql.status.cache.ssl.hits`*::
++
+--
+The number of SSL session cache hits.
+
+type: long
+
+--
+
+*`mysql.status.cache.ssl.misses`*::
++
+--
+The number of SSL session cache misses.
+
+type: long
+
+--
+
+*`mysql.status.cache.ssl.size`*::
++
+--
+The SSL session cache size.
+
+type: long
+
+--
+
+[float]
+=== table
+
+
+
+
+[float]
+=== open_cache
+
+
+
+
+*`mysql.status.cache.table.open_cache.hits`*::
++
+--
+The number of hits for open tables cache lookups.
+
+type: long
+
+--
+
+*`mysql.status.cache.table.open_cache.misses`*::
++
+--
+The number of misses for open tables cache lookups.
+
+type: long
+
+--
+
+*`mysql.status.cache.table.open_cache.overflows`*::
++
+--
+Number of times, after a table is opened or closed, a cache instance has an unused entry and the size of the instance is larger than table_open_cache / table_open_cache_instances
+
+
 type: long
 
 --
@@ -32737,7 +32884,7 @@ type: long
 *`mysql.status.handler.read.last`*::
 +
 --
-The number of requests to read the last key in an index. 
+The number of requests to read the last key in an index.
 
 
 type: long
@@ -32767,7 +32914,7 @@ type: long
 *`mysql.status.handler.read.rnd`*::
 +
 --
-The number of requests to read a row based on a fixed position. 
+The number of requests to read a row based on a fixed position.
 
 
 type: long
@@ -32777,7 +32924,7 @@ type: long
 *`mysql.status.handler.read.rnd_next`*::
 +
 --
-The number of requests to read the next row in the data file. 
+The number of requests to read the next row in the data file.
 
 
 type: long
@@ -32840,6 +32987,48 @@ type: long
 
 
 
+[float]
+=== rows
+
+
+
+
+*`mysql.status.innodb.rows.reads`*::
++
+--
+The number of rows reads into InnoDB tables.
+
+type: long
+
+--
+
+*`mysql.status.innodb.rows.inserted`*::
++
+--
+The number of rows inserted into InnoDB tables.
+
+type: long
+
+--
+
+*`mysql.status.innodb.rows.deleted`*::
++
+--
+The number of rows deleted into InnoDB tables.
+
+type: long
+
+--
+
+*`mysql.status.innodb.rows.updated`*::
++
+--
+The number of rows updated into InnoDB tables.
+
+type: long
+
+--
+
 [float]
 === buffer_pool
 
@@ -32875,7 +33064,7 @@ type: long
 *`mysql.status.innodb.buffer_pool.bytes.data`*::
 +
 --
-The total number of bytes in the InnoDB buffer pool containing data. 
+The total number of bytes in the InnoDB buffer pool containing data.
 
 
 type: long