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Metrics: add possibility to release handles and observer instruments #435

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merged 5 commits into from
Mar 17, 2020

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@mauriciovasquezbernal mauriciovasquezbernal commented Feb 20, 2020

Fixes #399.

This commit implements a solution for releasing instrument handles and observers.

For the handles it is based on a ref count that is increased each time the
handled is acquired, when the ref count reaches 0 the handle is removed on
collection time. The direct call convention is updated to release the handle
after it has been updated.

The observer instrument is only updated on collection time, so it can be removed
as soon as the user request to do so.

@mauriciovasquezbernal mauriciovasquezbernal force-pushed the mauricio/release-handle branch 2 times, most recently from 267b92c to 6d483c1 Compare February 20, 2020 15:52
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codecov-io commented Feb 20, 2020

Codecov Report

Merging #435 into master will increase coverage by 0.14%.
The diff coverage is 90.90%.

Impacted file tree graph

@@            Coverage Diff             @@
##           master     #435      +/-   ##
==========================================
+ Coverage   89.33%   89.48%   +0.14%     
==========================================
  Files          43       43              
  Lines        2176     2215      +39     
  Branches      248      250       +2     
==========================================
+ Hits         1944     1982      +38     
  Misses        161      161              
- Partials       71       72       +1     
Impacted Files Coverage Δ
...etry-sdk/src/opentelemetry/sdk/metrics/__init__.py 94.87% <90.00%> (+0.46%) ⬆️
...elemetry-api/src/opentelemetry/metrics/__init__.py 93.50% <100.00%> (+0.45%) ⬆️

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@mauriciovasquezbernal mauriciovasquezbernal force-pushed the mauricio/release-handle branch 4 times, most recently from f5ba16e to 100174b Compare March 3, 2020 12:45
This commit implements a solution for releasing instrument handles and observers.

For the handles it is based on a ref count that is increased each time the
handled is acquired, when the ref count reaches 0 the handle is removed on
collection time.  The direct call convention is updated to release the handle
after it has been updated.

The observer instrument is only updated on collection time, so it can be removed
as soon as the user request to do so.
@mauriciovasquezbernal mauriciovasquezbernal marked this pull request as ready for review March 3, 2020 13:04
@mauriciovasquezbernal mauriciovasquezbernal requested a review from a team March 3, 2020 13:04
@mauriciovasquezbernal mauriciovasquezbernal added the needs reviewers PRs with this label are ready for review and needs people to review to move forward. label Mar 9, 2020
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@lzchen lzchen left a comment

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LGTM

@lzchen lzchen mentioned this pull request Mar 9, 2020
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@c24t c24t left a comment

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LGTM. I think this is likely to change with the removal of labelsets or the addition of metrics views, but no reason to hold this PR up now.

@c24t c24t merged commit 4e551ba into open-telemetry:master Mar 17, 2020
@mauriciovasquezbernal mauriciovasquezbernal deleted the mauricio/release-handle branch April 14, 2020 21:50
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Release handle/bound instrument in metrics from memory upon direct metric calling convention
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