Zabbix Macro Functions Quiz - Timeleft Mastery

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Questions and Answers

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?

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'?

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?

The day before yesterday Signup and view all the answers

What is the purpose of absolute time shift in baseline monitoring and other functions?

To define the time interval for the functions Signup and view all the answers

What is the time period represented by '1M:now/M-1M+1d'?

First day of the previous month Signup and view all the answers

What does '2d:now/d+1d' indicate?

The day after tomorrow Signup and view all the answers

What does '1d:now/M+1d' represent?

The first day of the current month Signup and view all the answers

What is the significance of the time period '1w:now/M+1w'?

First week of the current month Signup and view all the answers

What does '1d:now/M-1M+1d' indicate?

First day of the previous month Signup and view all the answers

What algorithm does Zabbix's trendstl() function use by default?

Median absolute deviation (MAD) Signup and view all the answers

What does the anomaly rate represent in Zabbix's trendstl() function?

Ratio of anomaly values to total values Signup and view all the answers

Which Zabbix function is used to project future values for a specified item and time period?

forecast() Signup and view all the answers

What does Zabbix's timeleft() function indicate?

Time remaining until a threshold is reached Signup and view all the answers

In what situations does the forecast() function return -1 in Zabbix?

When the specified evaluation period contains no data Signup and view all the answers

What type of data patterns are recommended for trend prediction in Zabbix?

Linear or polynomial fits Signup and view all the answers

What is the purpose of the percentile function in Zabbix?

To find the value at a given percentage point in a dataset Signup and view all the answers

What are calculated items in Zabbix primarily used for?

Visualization purposes Signup and view all the answers

What type of trigger functions does Zabbix offer for predicting future system behavior?

Forecast() and timeleft() Signup and view all the answers

What is the range of anomaly rate in Zabbix's trendstl() function?

0 to 1 Signup and view all the answers

Which macro function can be used to format numbers with a specific number of digits after the decimal point?

fmtnum() Signup and view all the answers

What does the {TIME} macro in the event name field return?

Current date and time Signup and view all the answers

Which function is used to calculate the baseline by averaging data periods in seasons using the Weighted Moving Average algorithm?

baselinewma() Signup and view all the answers

What does a low standard deviation suggest about the data points in relation to the mean?

Data points are close to the mean Signup and view all the answers

What does Zabbix use for anomaly detection based on long-term trends analytics?

STL decomposition Signup and view all the answers

Which parameter is used to define the time period for trend functions in Zabbix?

time period Signup and view all the answers

What does the trendstl function in Zabbix use to calculate results?

STL decomposition Signup and view all the answers

What does the baselinedev() function return and compare the last period to?

Number of standard deviations Signup and view all the answers

What does the trendmax function in Zabbix analyze over a long period?

Maximum value Signup and view all the answers

What is the purpose of the strftime format codes in Zabbix?

To customize the output of the {TIME} macro Signup and view all the answers

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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Test your knowledge of Zabbix macro functions, time formatting, trend analysis, standard deviation, anomaly detection, and baseline monitoring with this informative quiz.

Zabbix Monitoring Quiz Day3 P4

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