---
title: "YB-Master metrics"
url: "https://docs.yugabyte.com/stable/launch-and-manage/monitor-and-alert/metrics/ybmaster/"
---

# YB-Master metrics

Learn about YugabyteDB's YB-Master metrics, and how to select and use the metrics.

Monitor table and tablet operations

The [YB-Master](/stable/architecture/yb-master/ "YB-Master") hosts system metadata, records about tables in the system and locations of their tablets, users, roles, permissions, and so on. YB-Masters are also responsible for coordinating background operations such as schema changes, handling addition and removal of nodes from the cluster, automatic re-replication of data on permanent failures, and so on.

All handler latency metrics include additional attributes. Refer to [Throughput and latency](/stable/launch-and-manage/monitor-and-alert/metrics/throughput/ "Throughput and latency").

The following are key metrics for evaluating YB-Master performance. All metrics are counters and units are microseconds.

| Metric (Counter \| microseconds)                            | Description                                                                                                                                                             |
|-------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `handler_latency_yb_master_MasterClient_GetTabletLocations` | Time spent on fetching the replicas from the master servers. This metric includes the number of times the locations of the replicas are fetched from the master server. |
| `handler_latency_yb_tserver_TabletServerService_Read`       | Time to read the PostgreSQL system tables (during DDL). This metric includes the count or number of reads.                                                              |
| `handler_latency_yb_tserver_TabletServerService_Write`      | Time to write the PostgreSQL system tables (during DDL). This metric includes the count or number of writes.                                                            |
| `handler_latency_yb_master_MasterDdl_CreateTable`           | Time to create a table (during DDL). This metric includes the count of create table operations.                                                                         |
| `handler_latency_yb_master_MasterDdl_DeleteTable`           | Time to delete a table (during DDL). This metric includes the count of delete table operations.                                                                         |

These metrics can be aggregated for nodes across the entire cluster using appropriate aggregations.