pantsbuild / pants / 35746
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LAST BUILD BRANCH: rust/upgrade-0.93.1
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Log long running workunits when the dynamic UI is disabled (#10890)

### Problem

The `--dynamic-ui` is enabled by default for end users, but is generally disabled in CI. Because our log levels have been tuned for the amount of information provided by the dynamic UI, disabling the UI does not leave quite enough information to determine where time is being spent.

### Solution

Adjusting log-levels based on whether the UI is enabled would add an additional dimension of complexity to choosing the level of a workunit. So instead, we attempt to ensure that the same sort of information usually rendered by the dynamic UI is rendered when it is disabled.

To avoid spamming the log, we periodically (iff `--no-dynamic-ui`) log any "visible, non-blocked workunits" (i.e., the same heuristic used by the dynamic UI) that have been running for longer than a threshold (aka: "stragglers").

### Result

```
./pants --no-dynamic-ui test src/python/pants/backend/python/::
<snip>
20:57:10.96 [INFO] Completed: Run tests - src/python/pants/backend/python/lint/pylint/rules_integration_test.py:integration succeeded.
20:57:17.55 [INFO] Long running tasks:
  284.57s 	Run Pytest for src/python/pants/backend/python/typecheck/mypy/rules_integration_test.py:integration
  319.51s 	Run Pytest for src/python/pants/backend/python/goals/pytest_runner_integration_test.py:integration
20:57:36.78 [INFO] Completed: Run tests - src/python/pants/backend/python/goals/pytest_runner_integration_test.py:integration succeeded.
20:57:47.59 [INFO] Long running tasks:
  314.61s 	Run Pytest for src/python/pants/backend/python/typecheck/mypy/rules_integration_test.py:integration
20:58:16.18 [INFO] Completed: Run tests - src/python/pants/backend/python/typecheck/mypy/rules_integration_test.py:integration succeeded.
```

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Jobs
ID Job ID Ran Files Coverage
4 35746.4 (PANTS_CONFIG_FILES="${TRAVIS_BUILD_DIR}/pants.travis-ci.toml" PANTS_DYNAMIC_UI=false LC_ALL="en_US.UTF-8" AWS_BUCKET=ci-public.pantsbuild.org BOOTSTRAPPED_PEX_KEY_PREFIX=daily/${TRAVIS_BUILD_NUMBER}/${TRAVIS_BUILD_ID}/pants.pex NATIVE_ENGINE_SO_KEY_PREFIX=monthly/native_engine_so PYENV_PY27_VERSION=2.7.18 PYENV_PY36_VERSION=3.6.10 PYENV_PY37_VERSION=3.7.7 PYENV_PY38_VERSION=3.8.3 PYENV_ROOT_OSX=${HOME}/.pants_pyenv PYENV_ROOT="${PYENV_ROOT:-${PYENV_ROOT_OSX}}" PATH="${PYENV_ROOT}/shims:${PATH}" AWS_CLI_ROOT="${HOME}/.aws_cli" AWS_ACCESS_KEY_ID__TO_BE_REEXPORTED_ON_DEPLOYS=AKIAV6A6G7RQ2HFZ5KP7 AWS_SECRET_ACCESS_KEY=[secure] RUST_BACKTRACE="all" BOOTSTRAPPED_PEX_KEY_SUFFIX=py37.linux PANTS_REMOTE_CA_CERTS_PATH=/usr/lib/google-cloud-sdk/lib/third_party/grpc/_cython/_credentials/roots.pem CACHE_NAME=python_tests.py37) 0
0.0
 Travis Job 35746.4
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