You can use the argument list of group_left to include extra labels from the right operand (parentheses and indents for clarity): ( max(consul_health_service_status{status=”critical”}) by (service_name,status,node) == 1 ) + on(service_name,node) group_left(env) ( 0 * consul_service_tags ) The important part here is the operation + on(service_name,node) group_left(env): the + is “abused” as a join operator (fine … Read more
If you want to really look at what is going on in the VM memory you should use a good tool like VisualVM. This is Free Software and it’s a great way to see what is going on. Nothing is really “wrong” with explicit gc() calls. However, remember that when you call gc() you are … Read more
Take a look at this PDF starting at page 38, ~slide I-77 and you’ll find all the info you need. Of course the rest of the slides are amazing, too, but those specifically deal with your issue: import time def follow(thefile): thefile.seek(0,2) # Go to the end of the file while True: line = thefile.readline() … Read more
You can log every query to a log file really easily: mysql> SHOW VARIABLES LIKE “general_log%”; +——————+—————————-+ | Variable_name | Value | +——————+—————————-+ | general_log | OFF | | general_log_file | /var/run/mysqld/mysqld.log | +——————+—————————-+ mysql> SET GLOBAL general_log = ‘ON’; Do your queries (on any db). Grep or otherwise examine /var/run/mysqld/mysqld.log Then don’t forget to … Read more
I’m working on an MIT-licensed library that helps Python programs monitor file system events as portably as possible. There are differences that I’m trying to iron out. Highly alpha version at the moment: Check it out here: http://github.com/gorakhargosh/watchdog/ Patches and contributions are welcome. Hope it helps. =) Cheers.
There are several ways to do this depending on the platform. I would choose from the following choices: Cross Platform Trolltech’s Qt has an object called QFileSystemWatcher which allows you to monitor files and directories. I’m sure there are other cross platform frameworks that give you this sort of capability too, but this one works … Read more
The relevant documentation can be found here: http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html Start your program with following parameters: -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9010 -Dcom.sun.management.jmxremote.rmi.port=9010 -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false For instance like this: java -Dcom.sun.management.jmxremote \ -Dcom.sun.management.jmxremote.port=9010 \ -Dcom.sun.management.jmxremote.local.only=false \ -Dcom.sun.management.jmxremote.authenticate=false \ -Dcom.sun.management.jmxremote.ssl=false \ -jar Notepad.jar -Dcom.sun.management.jmxremote.local.only=false is not necessarily required but without it, it doesn’t work on Ubuntu. The error would be something … Read more
In the interests of completeness there are a couple of other solutions which (in my opinion) are more orthodox than solutions relying on the SqlDependency (and SqlTableDependency) classes. SqlDependency was originally designed to make refreshing distributed webserver caches easier, and so was built to a different set of requirements than if it were designed as … Read more