[receiver/mysql]: add mysql.locked_connects metric (open-telemetry#14745

)

feat(mysqlreceiver): add mysql.locked_connects metric

.chloggen/drosiek-uptime-innodb-row-lock-metric.yaml

@@ -0,0 +1,16 @@
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: mysqlreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: add mysql.locked_connects metric
+
+# One or more tracking issues related to the change
+issues: [14138]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:

receiver/mysqlreceiver/documentation.md

@@ -19,6 +19,7 @@ These are the metrics available for this scraper.
 | **mysql.handlers** | The number of requests to various MySQL handlers. | 1 | Sum(Int) | <ul> <li>handler</li> </ul> |
 | **mysql.index.io.wait.count** | The total count of I/O wait events for an index. | 1 | Sum(Int) | <ul> <li>io_waits_operations</li> <li>table_name</li> <li>schema</li> <li>index_name</li> </ul> |
 | **mysql.index.io.wait.time** | The total time of I/O wait events for an index. | ns | Sum(Int) | <ul> <li>io_waits_operations</li> <li>table_name</li> <li>schema</li> <li>index_name</li> </ul> |
+| **mysql.locked_connects** | The number of attempts to connect to locked user accounts. | 1 | Sum(Int) | <ul> </ul> |
 | **mysql.locks** | The number of MySQL locks. | 1 | Sum(Int) | <ul> <li>locks</li> </ul> |
 | **mysql.log_operations** | The number of InnoDB log operations. | 1 | Sum(Int) | <ul> <li>log_operations</li> </ul> |
 | **mysql.operations** | The number of InnoDB operations. | 1 | Sum(Int) | <ul> <li>operations</li> </ul> |

receiver/mysqlreceiver/metadata.yaml

@@ -283,6 +283,15 @@ metrics:
       monotonic: false
       aggregation: cumulative
     attributes: [threads]
+  mysql.locked_connects:
+    enabled: true
+    description: The number of attempts to connect to locked user accounts.
+    unit: 1
+    sum:
+      value_type: int
+      input_type: string
+      monotonic: true
+      aggregation: cumulative
   mysql.tmp_resources:
     enabled: true
     description: The number of created temporary resources.

receiver/mysqlreceiver/scraper.go

@@ -274,6 +274,10 @@ func (m *mySQLScraper) scrapeGlobalStats(now pcommon.Timestamp, errs *scrapererr
 		case "Table_locks_waited":
 			addPartialIfError(errs, m.mb.RecordMysqlLocksDataPoint(now, v, metadata.AttributeLocksWaited))
 
+		// locked_connects
+		case "Locked_connects":
+			addPartialIfError(errs, m.mb.RecordMysqlLockedConnectsDataPoint(now, v))
+
 		// sorts
 		case "Sort_merge_passes":
 			addPartialIfError(errs, m.mb.RecordMysqlSortsDataPoint(now, v, metadata.AttributeSortsMergePasses))

receiver/mysqlreceiver/testdata/scraper/expected.json

@@ -1537,6 +1537,22 @@
                      },
                      "unit": "ns"
                   },
+                  {
+                     "description": "The number of attempts to connect to locked user accounts.",
+                     "name": "mysql.locked_connects",
+                     "sum": {
+                        "aggregationTemporality": "AGGREGATION_TEMPORALITY_CUMULATIVE",
+                        "dataPoints": [
+                           {
+                              "asInt": "293",
+                              "startTimeUnixNano": "1644862687825728000",
+                              "timeUnixNano": "1644862687825772000"
+                           }
+                        ],
+                        "isMonotonic": true
+                     },
+                     "unit": "1"
+                  },
                   {
                      "description": "The number of created temporary resources.",
                      "name": "mysql.tmp_resources",