collectors ExampleCollector

ExampleCollector

An example collector that verifies the answer to life, the universe, and everything does not change.

Dependencies

• A sane universe

Customizing a collector

Diamond collectors run within the diamond process and collect metrics that can be published to a graphite server.

Collectors are subclasses of diamond.collector.Collector. In their simplest form, they need to implement a single method called "collect".

import diamond.collector

class ExampleCollector(diamond.collector.Collector):

    def collect(self):
        # Set Metric Name
        metric_name = "my.example.metric"

        # Set Metric Value
        metric_value = 42

        # Publish Metric
        self.publish(metric_name, metric_value)

For testing collectors, create a directory (example below for /tmp/diamond) containing your new collector(s), their .conf files, and a copy of diamond.conf with the following options in diamond.conf:

[server]

user = ecuser
group = ecuser

handlers = diamond.handler.archive.ArchiveHandler
handlers_config_path = /tmp/diamond/handlers/
collectors_path = /tmp/diamond/collectors/
collectors_config_path = /tmp/diamond/collectors/

collectors_reload_interval = 3600

[handlers]

[[default]]

[[ArchiveHandler]]
log_file = /dev/stdout

[collectors]
[[default]]

and then run diamond in foreground mode:

# diamond -f -l --skip-pidfile -c /tmp/diamond/diamond.conf

Diamond supports dynamic addition of collectors. Its configured to scan for new collectors on a regular interval (configured in diamond.cfg). If diamond detects a new collector, or that a collectors module has changed (based on the file's mtime), it will be reloaded.

Diamond looks for collectors in /usr/lib/diamond/collectors/ (on Ubuntu). By default diamond will invoke the collect method every 60 seconds.

Diamond collectors that require a separate configuration file should place a .cfg file in /etc/diamond/collectors/. The configuration file name should match the name of the diamond collector class. For example, a collector called examplecollector.ExampleCollector could have its configuration file placed in /etc/diamond/collectors/ExampleCollector.cfg.

Options - Generic Options

Setting	Default	Description	Type
byte_unit	byte	Default numeric output(s)	str
enabled	False	Enable collecting these metrics	bool
measure_collector_time	False	Collect the collector run time in ms	bool
metrics_blacklist	None	Regex to match metrics to block. Mutually exclusive with metrics_whitelist	NoneType
metrics_whitelist	None	Regex to match metrics to transmit. Mutually exclusive with metrics_blacklist	NoneType

Example Output

servers.hostname.example.my.example.metric 42

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