Podcast
Questions and Answers
What is the syntax for absolute time periods?
What is the syntax for absolute time periods?
- Time operations followed by a colon, then time shift, and finally absolute time period
- Absolute time period followed by a colon, then time operations, and finally time shift
- Time shift followed by a colon, then absolute time period, and finally time operations (correct)
- Absolute time period followed by a colon, then time shift, and finally time operations
What does '1w:now/w+1w' represent?
What does '1w:now/w+1w' represent?
- Start of the current week
- End of the next week
- Start of the next week
- End of the current week (correct)
When is the time period '1d:now/d'?
When is the time period '1d:now/d'?
- 00:00 of the next day
- 00:00 of the previous day
- 12:00 noon of the current day
- 00:00 of the current day (correct)
What does '1d:now/d-1d' represent?
What does '1d:now/d-1d' represent?
What is the purpose of absolute time shift in baseline monitoring and other functions?
What is the purpose of absolute time shift in baseline monitoring and other functions?
What is the time period represented by '1M:now/M-1M+1d'?
What is the time period represented by '1M:now/M-1M+1d'?
What does '2d:now/d+1d' indicate?
What does '2d:now/d+1d' indicate?
What does '1d:now/M+1d' represent?
What does '1d:now/M+1d' represent?
What is the significance of the time period '1w:now/M+1w'?
What is the significance of the time period '1w:now/M+1w'?
What does '1d:now/M-1M+1d' indicate?
What does '1d:now/M-1M+1d' indicate?
What algorithm does Zabbix's trendstl() function use by default?
What algorithm does Zabbix's trendstl() function use by default?
What does the anomaly rate represent in Zabbix's trendstl() function?
What does the anomaly rate represent in Zabbix's trendstl() function?
Which Zabbix function is used to project future values for a specified item and time period?
Which Zabbix function is used to project future values for a specified item and time period?
What does Zabbix's timeleft() function indicate?
What does Zabbix's timeleft() function indicate?
In what situations does the forecast() function return -1 in Zabbix?
In what situations does the forecast() function return -1 in Zabbix?
What type of data patterns are recommended for trend prediction in Zabbix?
What type of data patterns are recommended for trend prediction in Zabbix?
What is the purpose of the percentile function in Zabbix?
What is the purpose of the percentile function in Zabbix?
What are calculated items in Zabbix primarily used for?
What are calculated items in Zabbix primarily used for?
What type of trigger functions does Zabbix offer for predicting future system behavior?
What type of trigger functions does Zabbix offer for predicting future system behavior?
What is the range of anomaly rate in Zabbix's trendstl() function?
What is the range of anomaly rate in Zabbix's trendstl() function?
Which macro function can be used to format numbers with a specific number of digits after the decimal point?
Which macro function can be used to format numbers with a specific number of digits after the decimal point?
What does the {TIME} macro in the event name field return?
What does the {TIME} macro in the event name field return?
Which function is used to calculate the baseline by averaging data periods in seasons using the Weighted Moving Average algorithm?
Which function is used to calculate the baseline by averaging data periods in seasons using the Weighted Moving Average algorithm?
What does a low standard deviation suggest about the data points in relation to the mean?
What does a low standard deviation suggest about the data points in relation to the mean?
What does Zabbix use for anomaly detection based on long-term trends analytics?
What does Zabbix use for anomaly detection based on long-term trends analytics?
Which parameter is used to define the time period for trend functions in Zabbix?
Which parameter is used to define the time period for trend functions in Zabbix?
What does the trendstl function in Zabbix use to calculate results?
What does the trendstl function in Zabbix use to calculate results?
What does the baselinedev() function return and compare the last period to?
What does the baselinedev() function return and compare the last period to?
What does the trendmax function in Zabbix analyze over a long period?
What does the trendmax function in Zabbix analyze over a long period?
What is the purpose of the strftime format codes in Zabbix?
What is the purpose of the strftime format codes in Zabbix?
Study Notes
Zabbix Macro Functions
- Macro functions like "fmtnum()" modify the output of macros by formatting numbers with a specific number of digits after the decimal point.
- Built-in macros like {ITEM.VALUE} and {ITEM.LASTVALUE}, as well as expression macros {.MACRO}, can be used with the fmtnum() function.
- The syntax of the macro function is {{.MACRO}.fmtnum(#)}, where # represents the number of digits after the decimal point.
- Examples of macro syntax and output are provided, demonstrating how the fmtnum() function formats the values.
Time Formatting in Zabbix
- The {TIME} macro in the event name field returns the current date and time, and strftime format codes can be used to change the output.
- Examples of using strftime format codes to customize the output of the {TIME} macro are provided.
- Time operations like (+1d, -1M, etc.) are allowed with the {TIME} macro.
Event Name Examples
- Examples of using macros and functions to compare available memory values and format the output are provided.
- The examples demonstrate how to use macros and functions to compare memory values, format the output, and include formatted dates in event names.
Trend Functions in Zabbix
- Zabbix offers multiple trend functions for data analysis over a long period, including trendavg, trendcount, trenddelta, trendmax, trendmin, trendavg, trendsum, and trendstl.
- These trend functions use the data from the trends table, and the TrendFunctionCache is used to calculate results.
- The time period and period_shift parameters are used to define the time period and shift for trend functions.
Standard Deviation
- Standard deviation is explained as a measure of data variability, indicating how dispersed the data is in relation to the mean.
- A low standard deviation suggests that data points are close to the mean, while a high or low standard deviation indicates that data points are above or below the mean.
Anomaly Detection and Baseline Monitoring
- Anomaly detection in Zabbix is based on long-term trends analytics, and it works if the majority of the data is considered "normal."
- Zabbix uses STL decomposition (Seasonal and Trend decomposition using Loess) and baseline monitoring for anomaly detection.
Baselinewma() Function
- The baselinewma() function returns the baseline by averaging data periods in seasons and uses the Weighted Moving Average algorithm (WMA).
- An example is provided to illustrate the comparison of web requests yesterday with the WMA on corresponding weekdays over the past 4 weeks using the baselinewma() function.
Baselinedev() Function
- The baselinedev() function returns the number of standard deviations and compares the last period to the periods within seasons.
- An example is provided to demonstrate how the baselinedev() function checks if the load for the last hour is more than 3 deviations away from the mean
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Description
Test your knowledge of Zabbix macro functions, time formatting, trend analysis, standard deviation, anomaly detection, and baseline monitoring with this informative quiz.
