Configuration
editConfiguration
editThere are several ways to configure how Elastic APM behaves.
The recommended way to configure Elastic APM is to create a file
config/elastic_apm.yml
and specify options in there:
--- server_url: 'http://localhost:8200' secret_token: <%= ENV["VERY_SECRET_TOKEN"] %>
Options are applied in the following order (last one wins):
- Defaults
-
Arguments to
ElasticAPM.start
/Config.new
-
Config file eg.
config/elastic_apm.yml
- Environment variables
Ruby on Rails
editWhen using Rails it’s also possible to specify options inside
config/application.rb
:
# config/application.rb config.elastic_apm.service_name = 'MyApp'
Sinatra and Rack
editWhen using APM with Sinatra and Rack you can configure it when starting the agent:
# config.ru or similar ElasticAPM.start( app: MyApp, service_name: 'SomeOtherName' )
See Getting started with Rack.
Options
editSome options can be set with ENV
variables and all of them may be set in
your source code.
When setting values for lists using ENV
variables, strings are split by comma
eg ELASTIC_APM_CUSTOM_KEY_FILTERS="a,b" # => [/a/, /b/]
.
config_file
editEnvironment | Config key |
Default |
---|---|---|
|
|
|
Path to the configuration YAML-file.
Elastic APM will load config options from this if the file exists.
The file will be evaluated as ERB, so you can include ENV
variables like in
your database.yml
, eg:
secret_token: <%= ENV['VERY_SECRET_TOKEN'] %>
server_url
editEnvironment | Config key |
Default |
---|---|---|
|
|
|
The URL for your APM Server.
The URL must be fully qualified, including protocol (http
or https
)
and port.
secret_token
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
A random string |
This string is used to ensure that only your agents can send data to your APM server. Both the agents and the APM server have to be configured with the same secret token. One example to generate a secure secret token is:
ruby -r securerandom -e 'print SecureRandom.uuid'
Secret tokens only provide any real security if your APM server use TLS.
active
editEnvironment |
|
Default |
|
|
|
Whether or not to start the agent.
If active
is false
, ElasticAPM.start
will do nothing and all calls to the root API will return nil
.
api_buffer_size
editEnvironment |
|
Default |
|
|
|
Maximum amount of objects kept in queue, before sending to APM Server.
If you hit this limit you either have to increase the agent’s worker pool size or it could mean the agent has trouble connecting to APM Server. The logs should tell you what went wrong.
api_request_size
editEnvironment |
|
Default |
|
|
|
Maximum amount of bytes sent over one request to APM Server. When reached the agent will open a new request.
It has to be provided in size format.
api_request_time
editEnvironment |
|
Default |
|
|
|
Maximum duration of a single streaming request to APM Server before opening a new one.
APM Server has its own limit of 30 seconds before it will close requests.
It has to be provided in duration format.
capture_body
editEnvironment |
|
Default |
Example |
For transactions that are HTTP requests,
the Ruby agent can optionally capture the request body (e.g. POST
variables or JSON data).
Possible values: "errors"
, "transactions"
, "all"
, "off"
.
If the request has a body and this setting is disabled, the body will be shown as [SKIPPED]
.
request bodies often contain sensitive values like passwords, credit card numbers etc. We try to strip sensitive looking data from form bodies but don’t touch text bodies like JSON. If your service handles data like this, we advise to only enable this feature with care.
capture_headers
editEnvironment |
|
Default |
|
|
|
Whether or not to attach the request headers to transactions and errors.
capture_env
editEnvironment |
|
Default |
|
|
|
Whether or not to attach ENV
from Rack to transactions and errors.
central_config
editEnvironment |
|
Default |
|
|
|
Enable APM Agent Configuration via Kibana.
If set to true
, the client will poll the APM Server regularly for new agent configuration.
Usually APM Server determines how often to poll, but if not the default interval is 5 minutes.
This feature requires APM Server v7.3 or later and that the APM Server is configured with kibana.enabled: true
.
custom_key_filters
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Elastic APM strips what looks like confidential information from the request/response headers. Use this option to add your own custom header keys to the list of filtered keys.
When setting this option via ENV
, use a comma separated string.
Eg. ELASTIC_APM_CUSTOM_KEY_FILTERS="a,b" # => [/a/, /b/]
default_tags
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Add default labels to every transaction. Note that this will eventually be deprecated in favor of global_labels
.
Be aware that labels are indexed in Elasticsearch. Using too many unique keys will result in Mapping explosion.
global_labels
are supported as of APM server version 7.2. default_tags
and default_labels
will eventually be
deprecated so please transition to using global_labels
instead. In the meantime, any default_labels
that are set will override global_labels
.
Environment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Add default tags to add to every transaction. Note that this option has been deprecated in favor of default_labels
.
Be aware that tags are indexed in Elasticsearch. Using too many unique keys will result in Mapping explosion.
global_labels
are supported as of APM server version 7.2. default_tags
and default_labels
will eventually be
deprecated so please transition to using global_labels
instead. In the meantime, any default_tags
that are set will override global_labels
.
disable_send
editEnvironment |
|
Default |
|
|
|
Disables sending payloads to APM Server.
disable_start_message
editEnvironment |
|
Default |
|
|
|
Disables the agent’s startup message announcing itself.
disabled_instrumentations
editEnvironment | Config key |
Default |
---|---|---|
|
|
|
Elastic APM automatically instruments select third party libraries. Use this option to disable any of these.
Get an array of enabled instrumentations with ElasticAPM.agent.config.enabled_instrumentations
.
environment
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
From |
|
The name of the environment this service is deployed in, e.g. "production" or "staging".
Environments allow you to easily filter data on a global level in the APM app. It’s important to be consistent when naming environments across agents. See environment selector in the APM app for more information.
Defaults to ENV['RAILS_ENV'] || ENV['RACK_ENV']
.
This feature is fully supported in the APM app in Kibana versions >= 7.2. You must use the query bar to filter for a specific environment in versions prior to 7.2.
filter_exception_types
editEnvironment |
|
Default |
Example |
N/A |
|
|
|
Use this to filter error tracking for specific error constants.
framework_name
editEnvironment | Config key |
Default |
---|---|---|
|
|
Depending on framework |
Name of the used framework.
For Rails or Sinatra, this defaults to Ruby on Rails
and Sinatra
respectively,
otherwise defaults to nil
.
framework_version
editEnvironment | Config key |
Default |
---|---|---|
|
|
Depending on framework |
Version number of the used framework.
For Ruby on Rails and Sinatra, this defaults to the used version of the framework,
otherwise, the default is nil
.
global_labels
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Labels added to all events, with the format key=value[,key=value[,…]].
This option requires APM Server 7.2 or greater, and will have no effect when using older
server versions. default_tags
will eventually be deprecated but in the meantime, their value
will override any global_labels
. Please transition to using global_labels
instead of
default_tags
in light of this deprecation.
hostname
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
The host name to use when sending error and transaction data to the APM server.
ignore_url_patterns
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Use this option to ignore certain URL patterns eg. healthchecks or admin sections.
Ignoring in this context means don’t wrap in a Transaction. Errors will still be reported.
When setting this option via ENV
, use a comma separated string.
Eg. ELASTIC_APM_IGNORE_URL_PATTERNS="a,b" # => [/a/, /b/]
instrument
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Use this option to ignore certain URL patterns eg. healthchecks or admin sections.
instrumented_rake_tasks
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Elastic APM can instrument your Rake tasks but given that they are used for a multitude of sometimes very different and not always relevant things, this is opt in.
log_level
editEnvironment | Config key |
Default |
---|---|---|
|
|
|
By default Elastic APM logs to stdout
or uses Rails.log
when used with Rails.
log_path
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
A path to a log file.
By default Elastic APM logs to stdout
or uses Rails.log
when used with Rails.
Should support both absolute and relative paths. Just make sure the directory exists.
logger
editEnvironment | Config key |
Default | Example |
---|---|---|---|
N/A |
|
Depends |
|
By default Elastic APM logs to stdout
or uses Rails.log
when used with Rails.
Use this to provide another logger. Expected to have the same API as Ruby’s built-in Logger
.
metrics_interval
editEnvironment | Config key |
Default |
---|---|---|
|
|
|
Specify the interval for reporting metrics to APM Server. The interval should be in seconds, or should include a time suffix.
To disable metrics reporting,
set the interval to 0
.
pool_size
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
Elastic APM uses a thread pool to send its data to APM Server.
This makes sure the agent doesn’t block the main thread any more than necessary.
If you have high load and get warnings about the buffer being full, increasing the worker pool size might help.
proxy_address
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
An address to use as a proxy for the HTTP client.
Options available are:
-
proxy_address
-
proxy_headers
-
proxy_password
-
proxy_port
-
proxy_username
There are also ENV
version of these following the same pattern of putting ELASTIC_APM_
in front.
See Http.rb’s docs.
service_name
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
App’s name |
|
The name of your service. This is used to keep all the errors and transactions of your service together and is the primary filter in the Elastic APM user interface.
If you’re using Ruby on Rails this will default to your app’s name. If you’re using Sinatra it will default to the name of your app’s class.
The service name must conform to this regular expression: ^[a-zA-Z0-9 _-]+$
.
In layman’s terms: Your service name must only contain characters from the ASCII
alphabet, numbers, dashes, underscores and spaces.
service_version
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
A string indicating the version of the deployed service |
Deployed version of your service.
Defaults to git rev-parse --verify HEAD
.
source_lines_error_app_frames
editsource_lines_error_library_frames
editsource_lines_span_app_frames
editsource_lines_span_library_frames
editEnvironment |
|
Default |
|
|
|
|
|
|
|
|
|
|
|
|
By default, the APM agent collects source code snippets for errors. With the above settings, you can modify how many lines of source code is collected.
We differ between errors and spans, as well as library frames and app frames.
Especially for spans, collecting source code can have a large impact on storage use in your Elasticsearch cluster.
span_frames_min_duration
editEnvironment |
|
Default |
|
|
|
Use this to disable stacktrace frame collection for spans with a duration shorter than or equal to the given amount of milleseconds.
The default is "5ms"
.
Set it to -1
to collect stack traces for all spans.
Set it to 0
to disable stack trace collection for all spans.
It has to be provided in duration format.
server_ca_cert
editEnvironment | Config key |
Default | Example |
---|---|---|---|
|
|
|
|
The path to a custom CA certificate for connecting to APM Server.
stack_trace_limit
editEnvironment | Config key |
Default |
---|---|---|
|
|
|
The maximum number of stack trace lines per span/error.
transaction_max_spans
editEnvironment |
|
Default |
|
|
|
Limits the amount of spans that are recorded per transaction. This is helpful in cases where a transaction creates a very high amount of spans (e.g. thousands of SQL queries). Setting an upper limit will prevent overloading the agent and the APM server with too much work for such edge cases.
transaction_sample_rate
editEnvironment |
|
Default |
|
|
|
By default, the agent will sample every transaction (e.g. request to your service).
To reduce overhead and storage requirements, you can set the sample rate to a value
between 0.0
and 1.0
.
We still record overall time and the result for unsampled transactions, but no
context information, tags, or spans.
verify_server_cert
editEnvironment |
|
Default |
|
|
|
By default, the agent verifies the SSL certificate if you use an HTTPS connection to
the APM server.
Verification can be disabled by changing this setting to false
.
Configuration formats
editSome options require a unit, either duration or size. These need to be provided in a specific format.
Duration format
editThe duration format is used for options like timeouts. The unit is provided as suffix directly after the number, without any separation by whitespace.
Example: "5ms"
Supported units
-
ms
(milliseconds) -
s
(seconds) -
m
(minutes)
Size format
editThe size format is used for options like maximum buffer sizes. The unit is provided as suffix directly after the number, without any separation by whitespace.
Example: 10kb
Supported units:
-
b
(bytes) -
kb
(kilobytes) -
mb
(megabytes) -
gb
(gigabytes)
we use the power-of-two sizing convention, e.g. 1 kilobyte == 1024 bytes