Percentage with used memory in Bosun
I've got a problem with doing a specific graph in Bosun. This graph should contain hosts with the highest memory usage in percentage, but I can't find any usable metric to do that. Of course I have os.mem.used just like os.mem.percent_free, but for me it isn't quite helpful. I thought of grabbing two series from query, just like for the alerting: total number of moemry and used one, divide used by total and multiply it by 100.
The problem seems to be that I can't divide series, so the last chance is to write my own metric by greping and awking free command in Linux.
If you really want a graph of percent_used instead of percent_free you should use 100-q("sum:os.mem.percent_free{host=$hosts}", "1h", ""). Then if you want to filter the series on the graph you should use the filter function. Example you can use on the expression page:
$hosts=ny-redis*|ny-devredis*
$limit=5
$avgfree=avg(q("sum:os.mem.percent_free{host=$hosts}", "1h", ""))
$lowest_free=limit(sort($avgfree,"asc"),$limit)
$percent_used=100-q("sum:os.mem.percent_free{host=$hosts}", "1h", "")
filter($percent_used,$lowest_free)
We have two dev instances and two prod instances, so with a limit of 5 I see all of them in the graph:
But you can change the expression to use $limit=2 and it would only show the top two:
however note the scale has been truncated. Right now I don't think there is any way to specify what scale to use on the expression page or in an alert template, but you could grab the raw data and graph it using a different graphing library.
- Match a string that contains a newline using sed
- How do you copy a multi-dimensional array (i.e. an array of arrays) in awk?
- How to print lines between two patterns, inclusive or exclusive (in sed, AWK or Perl)?
- Using sed / awk to process file with stanza format
- Using awk command to compare values in separate rows and multiple columns?
- awk and sed not working as I expect with neofetch
- Does awk support dynamic user-defined variables?
- Recognising backslash in awk field separator
- awk to find number of columns for each line and exit if more than required
- Can i use regex in the Record Separator in awk in linux
- Use blank line as file separator in awk
- How to cut ranges from end to start?
- Efficient way to read key=value pair from a bash file for each line to process it
- Generate many random alphanumeric strings
- calculate percentage and grade from input file in awk
- Add column to middle of tab-delimited file (sed/awk/whatever)
- Parsing a CSV file using gawk
- convert a fixed width file from text to csv
- increment a column and line number value using bash
- AWK: backslash as one of the many field seperators
- How to compare two tab-separated files and mark 'Fail' if col6 of file1 matches col2 of file2, else 'Pass'?
- find unique entries in one field across two CSV files with shell and friends
- How to use bash for loop to awk print FPAT string found in quoted variable
- right pad regex with spaces using sed or awk
- Bash script that takes multiple path arguments and checks if files can be successfully created there
- awk in pipeline to match patterns from multiple lines and print summary on trigger
- File output manipulation - ideally in one line
- Delete empty lines in csv file
- Calculate subtotals of the output of sort-unique command
- Transform SQL insert script into CSV format