Add new metrics for v3.6 (#1438)

* Add new metrics

* Typo

---------

Co-authored-by: Matea Pesic <80577904+matea16@users.noreply.github.com>

Author: Josipmrden

pages/database-management/monitoring.mdx

@@ -268,6 +268,16 @@ three different types:
  | ActivePointIndices         | Counter | Number of active point indices in the system.          |
  | ActiveTextIndices          | Counter | Number of active text indexes in the system.           |
 
+#### Memory metrics
+
+ | Name                            | Type      | Description                                                        |
+ | ------------------------------- | --------- | -------------------------------------------------------------------|
+ | GCLatency_us_50p                | Histogram | GC total cleanup time in microseconds (50th percentile).           |
+ | GCLatency_us_90p                | Histogram | GC total cleanup time in microseconds (90th percentile).           |
+ | GCLatency_us_99p                | Histogram | GC total cleanup time in microseconds (99th percentile).           |
+ | GCSkiplistCleanupLatency_us_50p | Histogram | GC time spent for cleaning skiplists in indexes (50th percentile). |
+ | GCSkiplistCleanupLatency_us_90p | Histogram | GC time spent for cleaning skiplists in indexes (90th percentile). |
+ | GCSkiplistCleanupLatency_us_99p | Histogram | GC time spent for cleaning skiplists in indexes (99th percentile). |
 
 #### Operator metrics
 
@@ -375,15 +385,17 @@ and describes a particular operation.
 
 #### Transaction metrics
 
- | Name                   | Type    | Description                                                                     |
- | ---------------------- | ------- | ------------------------------------------------------------------------------- |
- | ActiveTransactions     | Counter | Number of active transactions.                                                  |
- | CommittedTransactions  | Counter | Number of committed transactions.                                               |
- | RollbackedTransactions | Counter | Number of rollbacked transactions.                                              |
- | FailedQuery            | Counter | Number of times executing a query failed (either during parse time or runtime). |
- | FailedPrepare          | Counter | Number of times preparing a query failed.                                       |
- | FailedPull             | Counter | Number of times pulling a query failed.                                         |
- | SuccessfulQuery        | Counter | Number of successful queries.                                                   |
+ | Name                   | Type    | Description                                                                                                               |
+ | ---------------------- | ------- | --------------------------------------------------------------------------------------------------------------------------|
+ | ActiveTransactions     | Counter | Number of active transactions.                                                                                            |
+ | CommittedTransactions  | Counter | Number of committed transactions.                                                                                         |
+ | RollbackedTransactions | Counter | Number of rollbacked transactions.                                                                                        |
+ | FailedQuery            | Counter | Number of times executing a query failed (either during parse time or runtime).                                           |
+ | FailedPrepare          | Counter | Number of times preparing a query failed.                                                                                 |
+ | FailedPull             | Counter | Number of times pulling a query failed.                                                                                   |
+ | SuccessfulQuery        | Counter | Number of successful queries.                                                                                             |
+ | TransientErrors        | Counter | Number of times a transient error happened. Transient errors are those errors which can be retried.                       |
+ | WriteWriteConflicts    | Counter | Number of times a write-write conflict happened (2 transactions performing modification to the same node simultaneously). |
 
 
 #### Trigger metrics

pages/database-management/server-stats.md

@@ -202,6 +202,12 @@ SHOW METRICS;
 | "DiskUsage"                              | "Memory"            | "Gauge"     | 81508835   |
 | "MemoryRes"                              | "Memory"            | "Gauge"     | 339640320  |
 | "PeakMemoryRes"                          | "Memory"            | "Gauge"     | 339775488  |
+| "GCLatency_us_50p"                       | "Memory"            | "Histogram" | 1000       |
+| "GCLatency_us_90p"                       | "Memory"            | "Histogram" | 1000       |
+| "GCLatency_us_99p"                       | "Memory"            | "Histogram" | 1000       |
+| "GCSkiplistCleanupLatency_us_50p"        | "Memory"            | "Histogram" | 500        |
+| "GCSkiplistCleanupLatency_us_90p"        | "Memory"            | "Histogram" | 500        |
+| "GCSkiplistCleanupLatency_us_99p"        | "Memory"            | "Histogram" | 500        |
 | "AccumulateOperator"                     | "Operator"          | "Counter"   | 0          |
 | "AggregateOperator"                      | "Operator"          | "Counter"   | 0          |
 | "ApplyOperator"                          | "Operator"          | "Counter"   | 0          |
@@ -283,6 +289,8 @@ SHOW METRICS;
 | "FailedQuery"                            | "Transaction"       | "Counter"   | 0          |
 | "RollbackedTransactions"                 | "Transaction"       | "Counter"   | 0          |
 | "SuccessfulQuery"                        | "Transaction"       | "Counter"   | 1          |
+| "TransientErrors"                        | "Transaction"       | "Counter"   | 0          |
+| "WriteWriteConflicts"                    | "Transaction"       | "Counter"   | 0          |
 | "TriggersCreated"                        | "Trigger"           | "Counter"   | 0          |
 | "TriggersExecuted"                       | "Trigger"           | "Counter"   | 0          |
 +------------------------------------------+---------------------+-------------+------------+