diff --git a/pages/database-management/configuration.mdx b/pages/database-management/configuration.mdx
index d1e4182bf..e24ffb5bc 100644
--- a/pages/database-management/configuration.mdx
+++ b/pages/database-management/configuration.mdx
@@ -578,7 +578,7 @@ This section contains the list of all other relevant flags used within Memgraph.
 | `--log-retention-days=35`                       | Controls for how many days daily log files will be preserved. Allowed values: 1–1000000.                                                                                                                                                                                                                                                                     | `[uint64]` |
 | `--memory-limit=0`                              | Total memory limit in MiB. Set to 0 to use the default values which are 100% of the physical memory if the swap is enabled and 90% of the physical memory otherwise.                                                                                                                                                                                         | `[uint64]` |
 | `--metrics-address="0.0.0.0"`                   | Host for HTTP server for exposing metrics.                                                                                                                                                                                                                                                                                                                   | `[string]` |
-| `--metrics-format=JSON`                         | Format of the metrics HTTP endpoint. Allowed values: `OpenMetrics`, `JSON`. The `JSON` format is deprecated; use `OpenMetrics` for new deployments. See [monitoring](/database-management/monitoring#metrics-tracking-via-http-server-enterprise-edition) for details. | `[string]` |
+| `--metrics-format=OpenMetrics`                  | Format of the metrics HTTP endpoint. Allowed values: `OpenMetrics`, `JSON`. The `JSON` format is deprecated and will be removed in a future release. See [monitoring](/database-management/monitoring#metrics-tracking-via-http-server-enterprise-edition) for details. | `[string]` |
 | `--metrics-port=9091`                           | Port for HTTP server for exposing metrics.                                                                                                                                                                                                                                                                                                                   | `[int32]` |
 | `--memory-warning-threshold=1024`               | Memory warning threshold, in MB. If Memgraph detects there is less available RAM it will log a warning. <br/>Set to 0 to disable.                                                                                                                                                                                                                            | `[uint64]` |
 | `--monitoring-address="0.0.0.0"`                | IP address where the Memgraph's monitoring WebSocket server should listen.                                                                                                                                                                                                                                                                                   | `[string]` |
diff --git a/pages/database-management/monitoring.mdx b/pages/database-management/monitoring.mdx
index e967f5d25..077049f9d 100644
--- a/pages/database-management/monitoring.mdx
+++ b/pages/database-management/monitoring.mdx
@@ -209,16 +209,22 @@ The `--metrics-format` [configuration
 flag](/database-management/configuration#list-of-configuration-flags) controls
 the response format of the HTTP endpoint. The allowed values are:
 
-- **`OpenMetrics`**: Prometheus-compatible
+- **`OpenMetrics`** (default): Prometheus-compatible
 [OpenMetrics](https://openmetrics.io/) text format
 (`application/openmetrics-text`). Metrics are labeled per-database. Any
 OpenMetrics compatible clients can connect directly to Memgraph to scrape metrics.
-- **`JSON`** (default): A flat JSON object. The `JSON` format is deprecated.
+- **`JSON`**: A flat JSON object. The `JSON` format is deprecated.
 Using JSON with any OpenMetrics compatible client requires the [Prometheus
 exporter](https://github.com/memgraph/prometheus-exporter) middleware.
 
-New deployments should use `OpenMetrics`, which enables direct Prometheus
-scraping and provides per-database metric labels.
+<Callout type="warning">
+In Memgraph 3.13 and later, the default is `OpenMetrics`. In earlier versions the
+default was `JSON`. If you upgrade a deployment that relied on the JSON endpoint
+without setting the flag, the endpoint now serves OpenMetrics. Either update your
+monitoring dashboards, as described in [Migrating from JSON to
+OpenMetrics](#migrating-from-json-to-openmetrics), or set `--metrics-format=JSON`
+to keep the deprecated format for now.
+</Callout>
 
 ### Per-database metrics
 
@@ -566,8 +572,8 @@ scrape_configs:
 
 ### JSON monitoring (deprecated)
 
-Set `--metrics-format=JSON` (the current default) to enable the JSON endpoint.
-This format is deprecated and will be removed in a future release.
+Set `--metrics-format=JSON` to enable the JSON endpoint. This format is
+deprecated and will be removed in a future release.
 
 To retrieve the metrics, send a GET request to `http://host:port/metrics`
 or `http://host:port/`:
diff --git a/pages/release-notes.mdx b/pages/release-notes.mdx
index 4895c8f0f..749aeee0e 100644
--- a/pages/release-notes.mdx
+++ b/pages/release-notes.mdx
@@ -121,6 +121,14 @@ guide.
   in `toInteger()` instead of wrapping to a wrong value. Use `toIntegerOrNull()`
   if you want `null` for those inputs.
   [#4589](https://github.com/memgraph/memgraph/pull/4589)
+- The default value of `--metrics-format` changed from `JSON` to `OpenMetrics`.
+  A deployment that relied on the JSON metrics endpoint without setting the flag
+  now serves OpenMetrics after upgrading. Either update your monitoring
+  dashboards, as described in [Migrating from JSON to
+  OpenMetrics](/database-management/monitoring#migrating-from-json-to-openmetrics),
+  or set `--metrics-format=JSON` explicitly. The deprecated JSON endpoint
+  remains available for several releases.
+  [#4678](https://github.com/memgraph/memgraph/pull/4678)
 
 {<h4 className="custom-header">🐞 Bug fixes</h4>}