Merging upstream version 1.43.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!--startmeta
+custom_edit_url: "https://github.com/netdata/netdata/edit/master/collectors/proc.plugin/integrations/system_uptime.md"
+meta_yaml: "https://github.com/netdata/netdata/edit/master/collectors/proc.plugin/metadata.yaml"
+sidebar_label: "System Uptime"
+learn_status: "Published"
+learn_rel_path: "Data Collection/Linux Systems/System"
+message: "DO NOT EDIT THIS FILE DIRECTLY, IT IS GENERATED BY THE COLLECTOR'S metadata.yaml FILE"
+endmeta-->
+
+# System Uptime
+
+
+<img src="https://netdata.cloud/img/linuxserver.svg" width="150"/>
+
+
+Plugin: proc.plugin
+Module: /proc/uptime
+
+<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />
+
+## Overview
+
+The amount of time the system has been up (running).
+
+Uptime is a critical aspect of overall system performance:
+
+- **Availability**: Uptime monitoring can show whether a server is consistently available or experiences frequent downtimes.
+- **Performance Monitoring**: While server uptime alone doesn't provide detailed performance data, analyzing the duration and frequency of downtimes can help identify patterns or trends.
+- **Proactive problem detection**: If server uptime monitoring reveals unexpected downtimes or a decreasing uptime trend, it can serve as an early warning sign of potential problems.
+- **Root cause analysis**: When investigating server downtime, the uptime metric alone may not provide enough information to pinpoint the exact cause.
+- **Load balancing**: Uptime data can indirectly indicate load balancing issues if certain servers have significantly lower uptimes than others.
+- **Optimize maintenance efforts**: Servers with consistently low uptimes or frequent downtimes may require more attention.
+- **Compliance requirements**: Server uptime data can be used to demonstrate compliance with regulatory requirements or SLAs that mandate a minimum level of server availability.
+
+
+
+
+This collector is only supported on the following platforms:
+
+- linux
+
+This collector only supports collecting metrics from a single instance of this integration.
+
+
+### Default Behavior
+
+#### Auto-Detection
+
+This integration doesn't support auto-detection.
+
+#### Limits
+
+The default configuration for this integration does not impose any limits on data collection.
+
+#### Performance Impact
+
+The default configuration for this integration is not expected to impose a significant performance impact on the system.
+
+
+## Metrics
+
+Metrics grouped by *scope*.
+
+The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.
+
+
+
+### Per System Uptime instance
+
+
+
+This scope has no labels.
+
+Metrics:
+
+| Metric | Dimensions | Unit |
+|:------|:----------|:----|
+| system.uptime | uptime | seconds |
+
+
+
+## Alerts
+
+There are no alerts configured by default for this integration.
+
+
+## Setup
+
+### Prerequisites
+
+No action required.
+
+### Configuration
+
+#### File
+
+There is no configuration file.
+#### Options
+
+
+
+There are no configuration options.
+
+#### Examples
+There are no configuration examples.
+
+