What is the Prometheus Query Language (PromQL)?
PromQL is a language used in Prometheus to query time series data. Its core lies in filtering, aggregating and transforming data through indicator names and tags. 1. It supports directly entering the indicator name to view the relevant time series; 2. Use tag filtering such as {job="node-exporter"} to narrow the range; 3. Provide functions such as rate() to handle incremental counters; 4. Distinguish between real-time vectors (such as up) and range vectors (such as rate() required); 5. Can be used to calculate request rate, error rate and aggregate data across instances, such as avg() by (instance). Mastering PromQL helps build monitoring dashboards and set alert rules.
Jul 09, 2025 am 12:54 AM
How to access the advanced startup options in Windows 11?
The most direct way to enter the advanced startup options of Windows 11 is through the "Recovery" menu in the system settings. 1. Open the "Start Menu", click "Settings" → "System" → "Recover", and click "Restart Now" next to "Advanced Start" to enter the advanced startup interface; 2. Or run the command prompt as an administrator, enter the shutdown/r/o command to force restart to enter the interface; 3. If you need to enter safe mode, you need to select "Troubleshooting" → "Startup Settings" → "Restart" in the advanced startup interface, and then press the numeric keys 4 or F4 to enter. These three methods are suitable for general operations, remote or command line preference users, and scenarios where safe mode is required. It is recommended to use graphical interface operations first, command behavior
Jul 09, 2025 am 12:51 AM
How to fix 'Reboot and select proper boot device' error in Windows?
When you encounter the "RebootandSelectProperBootDevice" prompt, it is usually because the computer cannot find the boot device. 1. First check whether the hard disk is recognized by the motherboard, enter the BIOS to check whether the hard disk exists. If it is not recognized, check the connection between the SATA cable and the power cable, or adjust it to the first boot item; 2. If the hard disk is normal but the boot record is damaged, use the Windows installation USB disk to enter the command prompt to run bootrec/fixmb, bootrec/fixboot, bootrec/rebuildbcd in turn to repair the boot; 3. Confirm that the boot mode (UEFI/Legacy) in the BIOS matches the system installation mode, and you can use ms
Jul 09, 2025 am 12:46 AM
How to find my private and public IP address in Linux?
In Linux systems, 1. Use ipa or hostname-I command to view private IP; 2. Use curlifconfig.me or curlipinfo.io/ip to obtain public IP; 3. The desktop version can view private IP through system settings, and the browser can access specific websites to view public IP; 4. Common commands can be set as aliases for quick call. These methods are simple and practical, suitable for IP viewing needs in different scenarios.
Jul 09, 2025 am 12:37 AM
How to run a program as administrator in Windows?
There are three methods to run a program as an administrator. First, right-click the program icon and select "Run as administrator", which is suitable for temporary privilege hikes; second, modify the program shortcut properties and check "Run under administrator privileges" to automatically start as administrator each time; third, create a new task through the task manager and check the option to tick up the privilege, which is suitable for debugging or system failures.
Jul 09, 2025 am 12:37 AM
How to check CPU usage in Linux
Use the top command to quickly view real-time CPU usage, focusing on observing %Cpu(s) lines; 2. Install htop to obtain a clearer visual interface and support mouse operations; 3. Use mpstat to obtain detailed CPU usage statistics, which is suitable for analyzing performance trends. These three methods are suitable for rough viewing, intuitive display and in-depth analysis of scenarios.
Jul 09, 2025 am 12:34 AM
How to fix 'System Restore did not complete successfully' in Windows?
When encountering the "SystemRestoredidnotcompletely" problem, you can follow the following steps to solve it: 1. Ensure that the system disk has at least 5GB of free space, use the disk cleaning tool or increase the restore quota; 2. Run the sfc/scannow and DISM/Online/Cleanup-Image/RestoreHealth commands as an administrator to repair the system files; 3. Operate or disable third-party services and startup items in safe mode to eliminate interference; 4. Run chkdskC:/f/r to check and fix hard disk errors. After completing the above steps, restart the computer and try to restore.
Jul 09, 2025 am 12:33 AM
What is the difference between iCloud and iCloud Drive?
iCloud is the general term for Apple's cloud services, which is used to synchronize data such as photos, contacts, etc. between devices, and iCloudDrive is an internal file storage function module. 1.iCloud is a cloud service provided by Apple, used to synchronize various data such as photos, memos, contacts, etc. without the user's active operation; 2.iCloudDrive is a specific function in iCloud, similar to a network disk, allowing uploading, downloading and managing documents, PDFs and other files, and supports cross-device access and editing; 3. When using it, make sure that all devices are logged in to the same Apple ID, and enable the synchronization function of the corresponding application in the settings. Mac users can directly drag and drop files to iCloudDrive, while iPhone users can
Jul 09, 2025 am 12:29 AM
How to become root user in Linux
There are three main ways to become a root user in Linux: 1. Use the su command to switch, enter su- and provide the root password; 2. Execute a single command through sudo or use sudo-i to enter the rootshell; 3. Log in directly as root (not recommended), you need to set the password and modify the SSH configuration. It is recommended to give priority to the use of sudo to ensure safety.
Jul 09, 2025 am 12:28 AM
What does it mean if a Kubernetes Pod is in CrashLoopBackOff state?
CrashLoopBackOffinKubernetesoccurswhenacontainerrepeatedlycrashesafterstarting,leadingtoexponentialbackoffdelaysbeforerestarts.Commoncausesincludemisconfigurations,missingenvironmentvariables,faileddependencies,orapplicationerrors.Todiagnose:1)CheckP
Jul 09, 2025 am 12:13 AM
What is Apple Silicon M1/M2/M3?
AppleSiliconchipsM1,M2,andM3arecustom-designedSoCsthatintegrateCPU,GPU,neuralengine,andunifiedmemoryintoonechip,offeringbetterperformance,energyefficiency,andsoftware-hardwareintegration.1)UnifiedMemoryArchitectureallowsfasterdataaccessbysharinghigh-
Jul 09, 2025 am 12:09 AM
Fix configuration file error in Google Chrome
Google Chrome is undoubtedly the best browser for Windows. But sometimes, it can run into problems that make the browser unusable. One annoying issue among the many issues you may encounter with Chrome is the "Profile error occurred" issue. While you can fix this by updating your browser, it can turn into a recurring problem. So if you also experience Google Chrome profile errors, try the following solution to completely resolve the issue. What is a Google Chrome configuration file error? Configuration file errors are one of many issues you may encounter when using your browser. It mainly appears when launching Google Chrome, which means Chrome cannot
Jul 08, 2025 pm 02:39 PM
Fixed Windows 11 Google Chrome not opening
Fixed Windows 11 Google Chrome not opening Google Chrome is the most popular browser right now, but even it sometimes requires help to open on Windows. Then follow the on-screen instructions to complete the process. After completing the above steps, launch Google Chrome again to see if it works properly now. 5. Delete Chrome User Profile If you are still having problems, it may be time to delete Chrome User Profile. This will delete all your personal information, so be sure to back up all relevant data. Typically, you delete the Chrome user profile through the browser itself. But given that you can't open it, here's another way: Turn on Windo
Jul 08, 2025 pm 02:36 PM
Fixed the failure to upload files in Windows Google Chrome
Have problems uploading files in Google Chrome? This may be annoying, right? Whether you are attaching documents to emails, sharing images on social media, or submitting important files for work or school, a smooth file upload process is crucial. So, it can be frustrating if your file uploads continue to fail in Chrome on Windows PC. If you're not ready to give up your favorite browser, here are some tips for fixes that can't upload files on Windows Google Chrome 1. Start with Universal Repair Before we learn about any advanced troubleshooting tips, it's best to try some of the basic solutions mentioned below. Troubleshooting Internet connection issues: Internet connection
Jul 08, 2025 pm 02:33 PM
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