Tair (Redis® OSS-Compatible):Observability

Metrics

Redis provides a variety of metrics, including memory-related metrics (such as memory distribution, memory usage, and memory fragmentation ratio), statistics-related metrics (such as the number of connections and commands, network traffic, and synchronization status), CPU utilization, and keyspace information. Tair（Redis OSS-compatible） provides more fine-grained metrics in addition to the metrics supported by Redis to enhance user experience. The fine-grained metrics include read queries per second (QPS) and write QPS. For more information about these metrics, see View performance monitoring data.

Logs

Tair（Redis OSS-compatible） allows you to query active logs, slow query logs, audit logs, and latency insights of instances.

• Active logs

  Active logs of an instance record in rows the persistence, synchronous replication, and debugging operations that take place and error messages that appear when the instance is running.

  You can go to the details page of an instance in the console and choose Logs > Active Logs in the left-side navigation pane to view the active logs of the instance. For more information, see Query active logs.

• Slow query logs

  Slow query logs record requests that take longer than specific thresholds to execute. The execution duration of a request does not include the amount of time that the request spends in queuing or in transmission. Slow query log statistics include execution timestamps, execution durations, command parameters, and client information. You can view slow query logs of an instance to identify commands that take longer than required to run, and then optimize these commands to prevent service congestion.

  You can go to the details page of an instance in the console and choose Logs > Slow Logs in the left-side navigation pane to view the slow query logs of the instance. For more information, see Query slow logs.

• Audit logs

  Tair（Redis OSS-compatible） provides audit logs based on Simple Log Service. Audit logs include statistics such as log types, execution durations, database numbers, client IP addresses, account names, command details, and extension information. Audit logs allow you to search and analyze online operation logs (including logs of sensitive operations related to the FLUSHALL, FLUSHDB, and DEL commands), slow query logs, and active logs, and export these logs.

  You can go to the details page of an instance in the console and choose Logs > Audit Logs in the left-side navigation pane to view the audit logs of the instance. For more information, see Enable the audit log feature.

• Latency insights

  Tair（Redis OSS-compatible） provides the advanced latency insights feature. This feature can record up to 27 events and execution durations of all commands, and save all latency statistics within the last three days.

  You can go to the details page of an instance in the console and choose CloudDBA > Latency Insights in the left-side navigation pane to view the latency information of the instance. For more information, see Use the latency insights feature.

Analytics

Tair（Redis OSS-compatible） integrates metrics, traces, and logs to provide data analytics, which is a critical feature of Tair (Redis OSS-compatible).

• Hotkey and large key analysis

  If a key receives significantly more requests than other keys, the key is considered a hotkey. If a hotkey is not timely handled, skewed requests or even cache breakdowns may occur. If a key contains a large number of members or occupies a large amount of memory, the key is considered a large key. If a large key is not timely handled, commands that involve the key take longer to run and an out-of-memory (OOM) error may occur.

  You can use the Real-time Key Statistics feature of Tair（Redis OSS-compatible） to identify hotkeys and large keys. The Real-time Key Statistics feature displays hotkeys and large keys in real time and allows you to view the hotkeys and large keys that were generated within the last four days. The Real-time Key Statistics feature offers high accuracy and has minimal impact on performance. This feature allows you to view the amount of memory occupied by a key and the frequency at which a key is requested and troubleshoot hotkeys and large keys to optimize instances.

  You can go to the details page of an instance in the console and choose CloudDBA > Real-time Key Statistics in the left-side navigation pane to view statistics about hotkeys and large keys of the instance. For more information, see Use the real-time key statistics feature.

• Offline key analysis

  The Offline Key Analysis feature supports the processing of offline Redis Database (RDB) files of all data structures and from all instance architectures and Redis versions supported by Tair (Redis OSS-compatible), and does not affect online services provided by Tair (Redis OSS-compatible). The Offline Key Analysis feature can process a combination of 10% large keys and 90% small keys four times faster than redis-rdb-tool, and a combination of medium keys and large keys 20 times faster than redis-rdb-tool. During the process, memory usage is kept within 1 GB to prevent OOM errors that may occur due to large key processing. The Offline Key Analysis feature also allows you to search for the longest subelement to troubleshoot issues.

  You can go to the details page of an instance in the console and choose CloudDBA > Offline Key Analysis in the left-side navigation pane to view the offline key analysis results of the instance. For more information, see Use the offline key analysis feature.

• Instance diagnostics

  Tair（Redis OSS-compatible） integrates statistics such as performance metrics, slow query logs, and key analysis to provide the diagnostic report feature. This feature performs one-stop diagnostics to evaluate the health of instances based on statistics such as performance level, skewed request distribution, and slow query logs, and provides suggestions. This feature improves the automatic O&M capabilities of instances and reduces instance usage costs.

  You can go to the details page of an instance in the console and choose CloudDBA > Diagnostic Reports in the left-side navigation pane to perform diagnostics on the instance. For more information, see Create a diagnostic report.