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Fix spelling mistake, thanks Connor.
[ci skip]
See merge request !2227
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* Use commit objects instead of IDs when generating diffs
* Use proper references when generating MR's source and target
* Update broken specs
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This ensures we can still boot, even when the "application_settings"
table doesn't exist.
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Storing of application metrics in InfluxDB
This adds support for tracking metrics in InfluxDB, which in turn can be visualized using Grafana. For more information see #2936.
See merge request !2042
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This allows us to track the counts of actual classes instead of "T_XXX"
nodes. This is only enabled on CRuby as it uses CRuby specific APIs.
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This will be used to (for example) instrument all ActiveRecord models.
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This ensures we don't end up wasting resources by tracking method calls
that only take a few microseconds. By default the threshold is 10
milliseconds but this can be changed using the gitlab.yml configuration
file.
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This makes it possible to determine if a method should be instrumented
or not using a block.
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This allows the information to be displayed when using certain functions
(e.g. top()) as well as making it easier to aggregate on a per file
basis.
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InfluxDB escapes double quotes upon output which makes it a pain to deal
with. This ensures that if we're using PostgreSQL we don't store any
queries containing double quotes in InfluxDB, solving the escaping
problem.
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When using instrument_methods/instrument_instance_methods we only want
to instrument methods defined directly in a class, not those included
via mixins (e.g. whatever RSpec throws in during development).
In case an externally included method _has_ to be instrumented we can
still use the regular instrument_method/instrument_instance_method
methods.
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This makes it easier to instrument multiple modules without having to
type the full namespace over and over again.
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The methods Instrumentation.instrument_methods and
Instrumentation.instrument_instance_methods can be used to instrument
all methods of a module at once.
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The use of ActiveSupport would slow down instrumented method calls by
about 180x due to:
1. ActiveSupport itself not being the fastest thing on the planet
2. caller_locations() having quite some overhead
The use of caller_locations() has been removed because it's not _that_
useful since we already know the full namespace of receivers and the
names of the called methods.
The use of ActiveSupport has been replaced with some custom code that's
generated using eval() (which can be quite a bit faster than using
define_method).
This new setup results in instrumented methods only being about 35-40x
slower (compared to non instrumented methods).
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This is faster than using define_method since we don't have to keep
block bindings around.
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This adds the ability to write application metrics (e.g. SQL timings) to
InfluxDB. These metrics can in turn be visualized using Grafana, or
really anything else that can read from InfluxDB. These metrics can be
used to track application performance over time, between different Ruby
versions, different GitLab versions, etc.
== Transaction Metrics
Currently the following is tracked on a per transaction basis (a
transaction is a Rails request or a single Sidekiq job):
* Timings per query along with the raw (obfuscated) SQL and information
about what file the query originated from.
* Timings per view along with the path of the view and information about
what file triggered the rendering process.
* The duration of a request itself along with the controller/worker
class and method name.
* The duration of any instrumented method calls (more below).
== Sampled Metrics
Certain metrics can't be directly associated with a transaction. For
example, a process' total memory usage is unrelated to any running
transactions. While a transaction can result in the memory usage going
up there's no accurate way to determine what transaction is to blame,
this becomes especially problematic in multi-threaded environments.
To solve this problem there's a separate thread that takes samples at a
fixed interval. This thread (using the class Gitlab::Metrics::Sampler)
currently tracks the following:
* The process' total memory usage.
* The number of file descriptors opened by the process.
* The amount of Ruby objects (using ObjectSpace.count_objects).
* GC statistics such as timings, heap slots, etc.
The default/current interval is 15 seconds, any smaller interval might
put too much pressure on InfluxDB (especially when running dozens of
processes).
== Method Instrumentation
While currently not yet used methods can be instrumented to track how
long they take to run. Unlike the likes of New Relic this doesn't
require modifying the source code (e.g. including modules), it all
happens from the outside. For example, to track `User.by_login` we'd add
the following code somewhere in an initializer:
Gitlab::Metrics::Instrumentation.
instrument_method(User, :by_login)
to instead instrument an instance method:
Gitlab::Metrics::Instrumentation.
instrument_instance_method(User, :save)
Instrumentation for either all public model methods or a few crucial
ones will be added in the near future, I simply haven't gotten to doing
so just yet.
== Configuration
By default metrics are disabled. This means users don't have to bother
setting anything up if they don't want to. Metrics can be enabled by
editing one's gitlab.yml configuration file (see
config/gitlab.yml.example for example settings).
== Writing Data To InfluxDB
Because InfluxDB is still a fairly young product I expect the worse.
Data loss, unexpected reboots, the database not responding, you name it.
Because of this data is _not_ written to InfluxDB directly, instead it's
queued and processed by Sidekiq. This ensures that users won't notice
anything when InfluxDB is giving trouble.
The metrics worker can be started in a standalone manner as following:
bundle exec sidekiq -q metrics
The corresponding class is called MetricsWorker.
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Ci Project migrate
- This doesn't migrate: allow_git_fetch, coverage_regex, timeout. Since this are project configuration settings I would propose to migrate them to `.gitlab-ci.yml`.
- This requires offline migrations.
- It simplifies database models making all CI objects to be attached to: Project.
- It removes Ci::Project, but makes /ci/projects working by adding method: Project.find_by_ci_id for backward compatibility (badges, triggers).
- We should add default `timeout` to Application Settings.
- It misses specs.
- It is based on ci-services-migrate for now.
- It removes CI events.
- It removes administrator CI projects overview.
- It removes CI application settings.
In 8.4 or 8.5 we can remove redundant tables and columns.
See merge request !1987
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Ci Services migrate
See merge request !1985
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Enable rubocop metrics
This enables rubocop metrics like CyclomaticComplexity and ABCSize.
Initial threshold values are high, should be probably decreased.
See merge request !1802
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# Conflicts:
# spec/lib/gitlab/markdown/autolink_filter_spec.rb
# spec/lib/gitlab/markdown/commit_range_reference_filter_spec.rb
# spec/lib/gitlab/markdown/commit_reference_filter_spec.rb
# spec/lib/gitlab/markdown/cross_project_reference_spec.rb
# spec/lib/gitlab/markdown/emoji_filter_spec.rb
# spec/lib/gitlab/markdown/external_issue_reference_filter_spec.rb
# spec/lib/gitlab/markdown/external_link_filter_spec.rb
# spec/lib/gitlab/markdown/issue_reference_filter_spec.rb
# spec/lib/gitlab/markdown/label_reference_filter_spec.rb
# spec/lib/gitlab/markdown/merge_request_reference_filter_spec.rb
# spec/lib/gitlab/markdown/redactor_filter_spec.rb
# spec/lib/gitlab/markdown/reference_gatherer_filter_spec.rb
# spec/lib/gitlab/markdown/relative_link_filter_spec.rb
# spec/lib/gitlab/markdown/sanitization_filter_spec.rb
# spec/lib/gitlab/markdown/snippet_reference_filter_spec.rb
# spec/lib/gitlab/markdown/syntax_highlight_filter_spec.rb
# spec/lib/gitlab/markdown/table_of_contents_filter_spec.rb
# spec/lib/gitlab/markdown/task_list_filter_spec.rb
# spec/lib/gitlab/markdown/upload_link_filter_spec.rb
# spec/lib/gitlab/markdown/user_reference_filter_spec.rb
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Implement different Markdown rendering pipelines and cache Markdown
Builds on !1090.
Related to !1014.
Fixes #2054.
See merge request !1602
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