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Published: Jun 13, 2021 License: MIT Imports: 28 Imported by: 0



scollector is a replacement for OpenTSDB's tcollector.

Benefits of scollector over tcollector:

  • uses the OpenTSDB v2 API, not the older v1 API
  • more resource efficient
  • integrates with Bosun
  • comes with many collectors for Windows, Linux, and Mac

OpenTSDB 1.0 uses tcollector to collect data. This project aims to make scollector the preferred collector for OpenTSDB 2.0.




Scollector is a metric collection agent for OpenTSDB 2.0 and Bosun.

tcollector ( is OpenTSDB's data collection framework built for OpenTSDB 1.0. scollector aims to be tcollector for OpenTSDB 2.0 and is one method of sending data to Bosun ( for monitoring.

Unlike tcollector, scollector is a single binary where all collectors are compiled into scollector itself. scollector supports external collectors, but your goal should be to use those temporarily until the go version is written or the target system send data directly to OpenTSDB or Bosun. scollector has native collectors for Linux, Darwin, and Windows and can pull data from other systems such as AWS, SNMP, and vSphere.


scollector [flag]

The flags are:

	OpenTSDB or Bosun host. Overrides Host in conf file.
	Only include collectors matching these comma separated terms. Prefix
	with - to invert match and exclude collectors matching those terms. Use
	*,-term,-anotherterm to include all collectors except excluded terms.
	OpenTSDB batch size. Default is 500.
	Location of configuration file. Defaults to scollector.toml in directory of
	the scollector executable.
	List available collectors (after Filter is applied).
	Disable sending of metadata.
	Prints the version and exits.

Additional flags on Windows:

	Windows Service management; can be: install, remove, start, stop

Debug flags:

	enables debug output
	print to screen instead of sending to a host
	generates X fake data points per second on the test.fake metric

The only required paremeter is the host, which may be specified in the conf file or with -h.


scollector has not been tested outside of the Stack Exchange environment, and thus may act incorrectly elsewhere.

scollector requires the new HTTP API of OpenTSDB 2.1 with gzip support. Ensure that is in use if not using the OpenTSDB docker image.


If started with -p or -d, scollector logs to Stdout. Otherwise, on Unixes, scollector logs to syslog. On Windows when started as a service, the Event Log is used.

External Collectors

See for details about using external scripts or programs to collect metrics.

Configuration File

If scollector.toml exists in the same directory as the scollector executable or is specified via the -conf="" flag, it's content will be used to set configuration flags. The format is toml ( Available keys are:

Host (string): the OpenTSDB or Bosun host to send data, supports TLS and HTTP Basic Auth.

Host = ""

FullHost (boolean): enables full hostnames: doesn't truncate to first ".".

ColDir (string): is the external collectors directory.

Tags (table of strings): are added to every datapoint. If a collector specifies the same tag key, this one will be overwritten. The host tag is not supported.

Hostname (string): overrides the system hostname.

DisableSelf (boolean): disables sending of scollector self metrics.

Freq (integer): is the default frequency in seconds for most collectors.

BatchSize (integer): is the number of metrics that will be sent in each batch. Default is 500.

MaxQueueLen (integer): is the number of metrics keept internally. Default is 200000.

UserAgentMessage (string): is an optional message that will be appended to the User Agent when making HTTP requests. This can be used to add contact details so external services are aware of who is making the requests. Example: Scollector/0.6.0 (UserAgentMessage added here)

Filter (array of string): Only include collectors matching these terms. Prefix with - to invert match and exclude collectors matching those terms. Use *,-term,-anotherterm to include all collectors except excluded terms.

MetricFilters (array of string): only send metrics matching these regular expressions. Example ['^(win\.cpu|win\.system\..*)$', 'free']

IfaceExpr (string): Replaces the default regular expression for interface name matching on Linux.

PProf (string): optional IP:Port binding to be used for debugging with pprof. Examples: localhost:6060 for loopback or :6060 for all IP addresses.

MetricPrefix (string): optional Prefix prepended to all metrics path.

Collector configuration keys

Following are configurations for collectors that do not autodetect.

KeepalivedCommunity (string): if not empty, enables the Keepalived collector with the specified community.

KeepalivedCommunity = "keepalivedcom"

HAProxy (array of table, keys are User, Password, Instances): HAProxy instances to poll. The Instances key is an array of table with keys User, Password, Tier, and URL. If User is specified for an instance, User and Password override the common ones.

  User = "hauser"
  Password = "hapass"
    Tier = "1"
    URL = "http://ny-host01:17/haproxy\;csv"
    Tier = "2"
    URL = "http://ny-host01:26/haproxy\;csv"
    Tier = "3"
    URL = "http://ny-host01:40/haproxy\;csv"
    User = "hauser2"
    Password = "hapass2"
    Tier = "1"
    URL = "http://ny-host01:80/haproxy\;csv"

SNMP (array of table, keys are Community and Host): SNMP hosts to connect to at a 5 minute poll interval.

  Community = "com"
  Host = "host"
  MIBs = ["cisco"]
  Community = "com2"
  Host = "host2"
  # List of mibs to run for this host. Default is built-in set of ["ifaces","cisco"]
  MIBs = ["custom", "ifaces"]

MIBs (map of string to table): Allows user-specified, custom SNMP configurations.

  [] #can name anything you want
    BaseOid = "" # common base for all metrics in this mib

    # simple, single key metrics
      Metric = "cisco.cpu"
      Oid = "."
      Unit = "percent"
      RateType = "gauge"
      Description = "cpu percent used by this device"

    # can also iterate over snmp tables
      BaseOid = "." #common base oid for this tree

      # tags to apply to metrics in this tree. Can come from another oid, or specify "idx" to use
      # the numeric index as the tag value. Can specify multiple tags, but must supply one.
      # all tags and metrics should have the same number of rows per query.
        Key = "name"
        Oid = ".2"
        Metric = "cisco.mem.used"
        Oid = ".5"
        Metric = ""
        Oid = ".6"

ICMP (array of table, keys are Host): ICMP hosts to ping.

  Host = "internal-router"
  Host = "backup-router"

Vsphere (array of table, keys are Host, User, Password): vSphere hosts to poll.

  Host = "vsphere01"
  User = "vuser"
  Password = "pass"

AWS (array of table, keys are AccessKey, SecretKey, Region, BillingProductCodesRegex, BillingBucketName, BillingBucketPath, BillingPurgeDays): AWS hosts to poll, and associated billing information.

To report AWS billing information to OpenTSDB or Bosun, you need to configure AWS to generate billing reports, which will be put into an S3 bucket. See for more detail:

Once the reports are going into the S3, bucket, the Bucket Name and the Prefix Path that you entered during the report setup need to be entered below. Do not enter a blank bucket path as this is not supported.

Reports that are over a certain number of days old are purged by scollector. Set the key BillingPurgeDays to 0 to disable purging of old reports (not that this may increase your S3 usage costs as all reports are processed each time the collector runs).

Do not populate the Billing keys if you do not wish to load billing data into OpenTSDB or Bosun.

Only products whose name matches the BillingProductCodesRegex key will have their billing data sent to OpenTSDB or Bosun.

  AccessKey = "aoesnuth"
  SecretKey = "snch0d"
  Region = "somewhere"
  BillingProductCodesRegex = "^Amazon(S3|Glacier|Route53)$"
  BillingBucketName = "mybucket.billing"
  BillingBucketPath = "reports"
  BillingPurgeDays = 2

AzureEA (array of table, keys are EANumber, APIKey and LogBillingDetails): Azure Enterprise Agreements to poll for billing information.

EANumber is your Enterprise Agreement number. You can find this in your Enterprise Agreement portal.

APIKey is the API key as provided by the Azure EA Portal. To generate your API key for this collector, you will need to log into your Azure Enterprise Agreement portal (, click the "Download Usage" link, then choose "API Key" on the download page. You can then generate your API key there. Keys are valid 6 months, so you will require some maintenance of this collector twice a year.

LogBillingDetails tells scollector to add the following tags to your metrics:

  • costcenter
  • accountname
  • subscription

LogResourceDetails tell scollector to add the following tags to your metrics:

  • resoucegroup
  • resourcelocation

LogExtraTags tells scollector to take resource tags and add them to your metrics. Careful: this will add all tags as they exist in Azure, so you may end up with a large number of distinct tags if you are not careful. It will not process any tags that begin with "hidden".

If you are a heavy Azure EA user, then these additional tags may be useful for breaking down costs.

  EANumber = "123456"
  APIKey = "joiIiwiaXNzIjoiZWEubWljcm9zb2Z0YXp1cmUuY29tIiwiYXVkIjoiY2xpZW50LmVhLm1"
  LogBillingDetails = false
  LogResourceDetails = false
  LogExtraTags = false

Process: processes to monitor.

ProcessDotNet: .NET processes to monitor on Windows.

See for details about Process and ProcessDotNet.

HTTPUnit (array of table, keys are TOML, Hiera): httpunit TOML and Hiera files to read and monitor. See for documentation about the toml file. TOML and Hiera may both be specified, or just one. Freq is collector frequency as a duration string (default 5m).

  TOML = "/path/to/httpunit.toml"
  Hiera = "/path/to/listeners.json"
  TOML = "/some/other.toml"
  Freq = "30s"

Riak (array of table, keys are URL): Riak hosts to poll.

  URL = "http://localhost:8098/stats"

RabbitMQ (array of table, keys are URL): RabbitMQ hosts to poll. Regardless of config the collector will automatically poll management plugin on http://guest:guest@ .

  URL = "https://user:password@hostname:15671"

Cadvisor: Cadvisor endpoints to poll. Cadvisor collects system statistics about running containers. See for documentation about configuring cadvisor. You can enable per cpu usage metric reporting optionally, and optionally use IsRemote to disable block device lookups.

	URL = "http://localhost:8080"
	PerCpuUsage = true
	IsRemote = false

RedisCounters: Reads a hash of metric/counters from a redis database.

    Server = "localhost:6379"
    Database = 2

Expects data populated via bosun's udp listener in the "scollectorCounters" hash.

ExtraHop (array of table): ExtraHop hosts to poll. The two filter options specify how scollector should filter out traffic from being submitted. The valid options are:

  • namedprotocols (Only protocols that have an explicit name are submitted. The rest of the traffic will be pushed into proto=unnamed. So any protocol that begins with "tcp", "udp" or "SSL" will not be submitted (with the exception of SSL443).
  • toppercent (The top n% of traffic by volume will be submitted. The rest of the traffic will be pushed into proto=otherproto)
  • none (All protocols of any size will be submitted)

FilterPercent applies when the FilterBy option is set to "toppercent". Only protocols that account for this much traffic will be logged. For example, if this is set to 90, then if the protocol accounts for less than 10% of the traffic, it will be dropped. This is OK if your traffic is heavilly dominated by asmall set of protocols, but if you have a fairly even spread of protocols then this filtering loses its usefulness.

AdditionalMetrics is formatted as such: [object_type].[object_id].[metric_category].[metric_spec_name]

  • object_type: is one of: "network", "device", "application", "vlan", "device_group", "activity_group"
  • object_id: can be found by querying the ExtraHop API (through the API Explorer) under the endpoint for the object type. For example, for "application", you would query the "/applications/" endpoint and locate the ID of the application you want to query.
  • metric_category: can be found in the Metric Catalogue for the metric you are wanting to query. e.g. for custom metrics, this is always "custom_detail"
  • metric_spec_name: can be found in the Metric Catalogue for the metric you are wanting to query. e.g. for custom metrics, this is name you have specified in metricAddDetailCount() function in a trigger.

For these additional metrics, it is expected that the key for the metric is in a keyvalue, comma seperated pair. This key will be converted into an OpenTSDB tagset. For example, if you have a key of "client=,server=,port=21441", this will be converted into an OpenTSDB tagset of the same values.

CAUTION: Do not include unbounded values in your key if you can help it. Putting in something like client IP, or source/destination port, which are out of your control and specified by people external to your network, could end up putting millions of different keys into your Bosun instance - something you probably don't want.

CertificateSubjectMatch and CertificateActivityGroup are used for collecting SSL information from ExtraHop. The key CertificateSubjectMatch is used to match against the certificate subject. If there is no match, we discard the certificate record. This is important as certificate subjects are essentially unbound, as EH return all certificates it sees, regardless of where they originated.

The key CertificateActivityGroup is the Activity Group you want to pass through to ExtraHop to pull the certificates from. There is a group called "SSL Servers" which is most likely the group you want to use. You will need to discover the group number for this group and put it in here.

	  Host = "extrahop01"
	  APIkey = "abcdef1234567890"
	  FilterBy = "toppercent"
	  FilterPercent = 75
    AdditionalMetrics = [ " trigger metric" ]
		CertificateSubjectMatch = "example.(com|org|net)"
		CertificateActivityGroup = 46

LocalListener (string): local_listener will listen for HTTP request and forward the request to the configured OpenTSDB host while adding defined tags to metrics.

LocalListener = "localhost:4242"

TagOverride (array of tables, key are CollectorExpr, MatchedTags and Tags): if a collector name matches CollectorExpr MatchedTags and Tags will be merged to all outgoing message produced by the collector, in that order. MatchedTags will apply a regexp to the tag defined by the key name and add tags based on the named match groups defined in the regexp. After tags defined in Tags will be merged, defining a tag as empty string will deletes it.

  CollectorExpr = 'cadvisor'
    docker_name = 'k8s_(?P<container_name>[^\.]+)\.[0-9a-z]+_(?P<pod_name>[^-]+)'
    docker_id = '^(?P<docker_id>.{12})'
    docker_name = ''
    source = 'kubelet'

Oracles (array of table, keys are ClusterName, Instances): Oracle database instances to poll. The Instances key is an array of table with keys ConnectionString and Role, which are the same as using sqlplus.

  ClusterName = "oracle rac name"
    ConnectionString = "/"
    Role = "sysdba"
    ConnectionString = "username/password@oraclehost/sid"
    ConnectionString = "/@localnodevip/sid"
    Role = "sysdba"

By default Elastic nodes are auto-detected on localhost:9200, but if you have a node running on another network interface, a non-standard port or even multiple nodes running on the same host you can use the Elastic configuration. Also lets you specify basic auth credentials and using TLS by setting the Scheme to https:

  Host = ""
  Port = 9201
  ClusterInterval = "10s"
  IndexInterval = "1m"
  User = "user"
  Password = "pass"
  Scheme = "https"

  Host = ""
  Port = 9202
  ClusterInterval = "10s"
  IndexInterval = "1m"


scollector has full Windows support. It can be run standalone, or installed as a service (see -winsvc). The Event Log is used when installed as a service.


Path Synopsis
Package conf contains all of the configuration structs for scollector.
Package conf contains all of the configuration structs for scollector.

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