> ## Documentation Index > Fetch the complete documentation index at: https://fly-io-actions-update-machines-openapi.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Monitoring and Metrics Illustration by Annie Ruygt of a balloon doing a lot of tasks ## Performance Monitoring The Managed Postgres dashboard provides comprehensive performance monitoring and metrics for your PostgreSQL clusters. The **Metrics** tab gives you real-time visibility into your database's performance, helping you identify bottlenecks and optimize your applications. ### Accessing Metrics To view metrics for your cluster: 1. Navigate to your MPG cluster in the Fly.io dashboard 2. Click the **Metrics** tab 3. Optionally filter by specific database using the database dropdown 4. Select your desired time range (5 minutes, 15 minutes, 1 hour, 6 hours, 24 hours, 2 days, or 7 days) On older v1 clusters, the Metrics tab may show a **New Metrics System Available** card instead of charts. Enabling the new metrics system restarts all Postgres nodes in your cluster to apply the monitoring configuration. On v2 clusters, if a database machine was recently throttled significantly, a **CPU throttling detected** or **Severe CPU throttling** banner appears at the top of the tab. ### Metrics tiles The top of the **Metrics** tab shows four tiles with the cluster's current state: | Tile | Description | | - | - | | **Database Connections** | Current connections to the selected database, against the cluster-wide `max_connections` setting | | **Pooled Connections** | Current number of clients on the PGBouncer pool, active and waiting combined | | **Longest Query** | Duration of the longest-running active query in the selected database | | **Replication Lag** | Current maximum replay lag. The same measurement as the Replication Delay Seconds chart, as a single current value | ### Available Charts and Metrics Below the tiles, each chart plots its series over the selected time range, with each series' average shown underneath. The charts are grouped into these categories: #### System Resource Metrics | Metric | Description | | - | - | | **Database CPU Utilization** | CPU usage percentage for each database instance, labeled with Primary (P) and Replica (R) badges. On v2 clusters this chart also shades periods when the database was CPU-throttled. A throttled machine can otherwise appear to sit at a flat 100% CPU | | **Database Memory Utilization** | Memory usage over time for Primary and Replica database instances, labeled with instance IDs | | **Pooler CPU Utilization** | CPU usage percentage for PGBouncer connection pooler instances. Typically remains low under normal operations | | **Pooler Memory Utilization** | Memory consumption for connection pooler instances. Shows usage for each pooler with instance IDs | #### Connection Metrics | Metric | Description | | - | - | | **Database Connections** | Active and idle database connections over time | | **Pooler Connections** | Tracks active and waiting connections through PGBouncer | #### Database Operations | Metric | Description | | - | - | | **Database Operations** | Row-level operations per second broken down into selects, inserts, updates, and deletes. Shows throughput patterns and workload distribution across operation types | | **Cache Hit Ratio** | Proportion of block accesses served from PostgreSQL's buffer cache. Reads outside that cache may still be served by the operating system's page cache. | | **Deadlocks** | Count of database deadlocks detected when two or more transactions are waiting for each other to release locks. Shows frequency and timing of these mutual blocking situations | #### Storage | Metric | Description | | - | - | | **Database Size** | Database size over time. Use the database dropdown to view a specific database | #### Replication Metrics | Metric | Description | | - | - | | **Replication Delay Bytes** | Amount of WAL (Write-Ahead Log) data in bytes that the replica is behind the primary. Measures the volume of changes waiting to be applied | | **Replication Delay Seconds** | Time in seconds that the replica lags behind the primary database. Represents how long ago the replica's current state reflects the primary | ## Overview tiles (v2 clusters) The **Overview** page of a v2 cluster (marked **v2** next to the cluster name) shows summary tiles with the cluster's current state. v1 clusters do not have these tiles. | Tile | Description | | - | - | | **CPU Usage** | Current CPU use of the primary | | **Memory Usage** | Current memory use of the primary | | **Storage Usage** | Approximate storage consumed by user databases, shown against each node's allocated storage. Excludes WAL and system overhead, so it does not represent total volume usage or remaining capacity | | **Active Connections** | Open connections to your databases, including idle connections, against the cluster's `max_connections` setting | | **Uptime** | How long the cluster has continuously had a primary up, over the last 30 days |