Apache Airflow - A platform to programmatically author, schedule, and monitor workflows
APACHE-2.0 License
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Published by ephraimbuddy over 1 year ago
DagRun.run_id
and allow flexibility (#32293)executor_class
from Job - fixing backfill for custom executors (#32219)mapIndex
to display extra links per mapped task. (#32154)re2
for matching untrusted regex (#32060)dag_dependencies
in serialized dag (#32037)None
if an XComArg fails to resolve in a multiple_outputs Task (#32027)rendered-templates
when map index is not found (#32011)ExternalTaskSensor
when there is no task group TIs for the current execution date (#32009)operator_extra_links
property serialization in mapped tasks (#31904)xcom_pull
and inlets
(#31128)on_failure_callback
is not invoked when task failed during testing dag. (#30965)ExternalPythonOperator
and debug logging level (#30367)task.sensor
annotation in type stub (#31954)Pydantic
to < 2.0.0
until we solve 2.0.0
incompatibilities (#32312)Pydantic
2 pickiness about model definition (#32307)™
to Airflow in prominent places (#31977)Published by jedcunningham over 1 year ago
2.6.2
(#31979)The default Airflow image that is used with the Chart is now 2.6.2
, previously it was 2.5.3
.
executor
and config.core.executor
match (#30693)minAvailable
property for PodDisruptionBudget (#30603)volumeMounts
to dag processor waitForMigrations
(#30990)waitForMigrations
for workers (#31625)priorityClassName
to K8S worker pod template (#31328)apiVersion
and kind
order in chart templates (#31850)Published by eladkal over 1 year ago
map_index
to the xcom key when skipping downstream tasks (#31541)/health
endpoint (#31529)max_active_tis_per_dagrun
for Dynamic Task Mapping (#31406)url_for_asset
fallback and 404 on DAG Audit Log (#31233)default_args
in nested task groups (#31608)[secrets] backend_kwargs
as a sensitive config (#31788)Published by ephraimbuddy over 1 year ago
Job
classes (#31277).In the past SchedulerJob and other *Job
classes are known to have been used to perform
external health checks for Airflow components. Those are, however, Airflow DB ORM related classes.
The DB models and database structure of Airflow are considered as internal implementation detail, following
public interface <https://airflow.apache.org/docs/apache-airflow/stable/public-airflow-interface.html>
_).
Therefore, they should not be used for external health checks. Instead, you should use the
airflow jobs check
CLI command (introduced in Airflow 2.1) for that purpose.
job_type
column (#31182)api_client_retry_configuration
(#31174)interleave_timestamp_parser
config to the logging section (#31102)MappedTaskGroup
import in taskinstance file (#31100)apache-hive
extra so it installs the correct package (#31068)airflow providers get
command output (#30978)pandas.DataFrame
(#30943)order_by
request in list DAG rest api (#30926)state
and start_date
from being reset when clearing a task in a running DagRun (#30125)dag_processing.processes
metric (#30891)config
directory in docker compose (#30662)version_added
config field for might_contain_dag
and metrics_allow_list
(#30969)Published by ephraimbuddy over 1 year ago
Default setting handles case where impersonation is needed and both users (airflow and the impersonated user)
have the same group set as main group. Previously the default was also other-writeable and the user might choose
to use the other-writeable setting if they wish by configuring file_task_handler_new_folder_permissions
and file_task_handler_new_file_permissions
in logging
section.
This stops SLA callbacks from keeping the dag processor manager permanently busy. It means reduced CPU,
and fixes issues where SLAs stop the system from seeing changes to existing dag files. Additional metrics added to help track queue state.
cleanup()
method in BaseTrigger is now defined as asynchronous (following async/await) pattern (#30152).This is potentially a breaking change for any custom trigger implementations that override the cleanup()
method and uses synchronous code, however using synchronous operations in cleanup was technically wrong,
because the method was executed in the main loop of the Triggerer and it was introducing unnecessary delays
impacting other triggers. The change is unlikely to affect any existing trigger implementations.
scheduler.tasks.running
no longer exist (#30374)The gauge has never been working and its value has always been 0. Having an accurate
value for this metric is complex so it has been decided that removing this gauge makes
more sense than fixing it with no certainty of the correctness of its value.
task_queued_timeout
config (#30375)Logic for handling tasks stuck in the queued state has been consolidated, and the all configurations
responsible for timing out stuck queued tasks have been deprecated and merged into
[scheduler] task_queued_timeout
. The configurations that have been deprecated are
[kubernetes] worker_pods_pending_timeout
, [celery] stalled_task_timeout
, and
[celery] task_adoption_timeout
. If any of these configurations are set, the longest timeout will be
respected. For example, if [celery] stalled_task_timeout
is 1200, and [scheduler] task_queued_timeout
is 600, Airflow will set [scheduler] task_queued_timeout
to 1200.
The configurations view now only displays the running configuration. Previously, the default configuration
was displayed at the top but it was not obvious whether this default configuration was overridden or not.
Subsequently, the non-documented endpoint /configuration?raw=true
is deprecated and will be removed in
Airflow 3.0. The HTTP response now returns an additional Deprecation
header. The /config
endpoint on
the REST API is the standard way to fetch Airflow configuration programmatically.
ExternalTaskSensor now has an explicit skipped_states
list
Maximum retry task delay is set to be 24h (86400s) by default. You can change it globally via core.max_task_retry_delay
parameter.
The Hive Macros (hive.max_partition
, hive.closest_ds_partition
) are available only when Hive Provider is
installed. Please install Hive Provider > 5.1.0 when using those macros.
max_active_tis_per_dagrun
for Dynamic Task Mapping (#29094)TriggerDagRunOperator
(#30292)Blocklist
to disable specific metric tags or metric names (#29881)check_migrations
config (#29714)cli.dags.trigger
(#29224)db export-archived
command. (#29485)airflow db drop-archived
command (#29309)FileTrigger
(#29265)connections import
CLI command (#28738)AIP-51 <https://github.com/apache/airflow/pulls?q=is%3Apr+is%3Amerged+label%3AAIP-51+milestone%3A%22Airflow+2.6.0%22>
_)UX
in grid view (#30373)select()
to new style (#30515)metrics_*_list
(#30174)on_*_callback/sla_miss_callbacks
(#28469)renamed
and previous_name
in config sections (#28324)triggerer
status (#27755)too old resource version exception
by retrieving the latest resource_version
(#30425)TriggerDagRunOperator
with deferrable parameter (#30406)example_sensor_decorator
DAG (#30513)skip_exit_code
in BashOperator
(#30734)scheduler.tasks.running
(#30374)/airflow/www
(#30568)/airflow/www
(#30319)/airflow/www
(#30316)dag.fileloc
instead of dag.full_filepath
in exception message (#30610)importlib-metadata
backport to < 5.0.0 (#29924)importlib.metadata
to get Version for speed (#29723)db export-cleaned
to db export-archived
(#29450)freezegun
with time-machine (#28193)airflow/kubernetes/*
(#28212)audit_logs.rst
(#30405)*_lookup_pattern
parameters (#29580)Published by jedcunningham over 1 year ago
The PgBouncer and PgBouncer Exporter images are based on newer software/os. They are also multi-platform AMD/ARM images:
pgbouncer
: 1.16.1 based on alpine 3.14 (airflow-pgbouncer-2023.02.24-1.16.1
)pgbouncer-exporter
: 0.14.0 based on alpine 3.17 (apache/airflow:airflow-pgbouncer-exporter-2023.02.21-0.14.0
)2.5.3
(#30411)The default Airflow image that is used with the Chart is now 2.5.3
, previously it was 2.5.1
.
hostAliases
for Airflow webserver and scheduler (#30051)ttlSecondsAfterFinished
on migrateDatabaseJob
and createUserJob
(#29314)config.kubernetes_executor
to values (#29818)kerberos.keytab
to worker when enabled (#29526)bitnami/postgresql
default username and password (#29478)postgresql.nameOverride
is used (#29214)airflow_dags_mount
formatting (#29296)webserver.service.ports
formatting (#29297)Published by pierrejeambrun over 1 year ago
No significant changes.
dag.partial_subset
doesn't mutate task group properties (#30129)airflow dags next-execution
cli command (#30117)TriggerRuleDep
when the mapped tasks count is 0 (#30084)Published by pierrejeambrun over 1 year ago
In case of API calls, it was possible that "+" passed as part of the date-time fields were not URL-encoded, and
such date-time fields could pass validation. Such date-time parameters should now be URL-encoded (as %2B
).
In case of parameters, we still allow IS8601-compliant date-time (so for example it is possible that
' ' was used instead of T
separating date from time and no timezone was specified) but we raise
deprecation warning.
[webserver] expose_hostname
changed to False
(#29547)The default for [webserver] expose_hostname
has been set to False
, instead of True
. This means administrators must opt-in to expose webserver hostnames to end users.
/dagRuns
API should 404 if dag not active (#29860)openapi
spec responses by adding additional return type (#29600)prev_logical_date
variable offset-aware (#29454)Edgemodifier
refactoring w/ labels in TaskGroup edge case (#29410)airflow connections add
(#28922)undici
from 5.9.1
to 5.19.1
(#29583)v67.2.0
(#29465)ua-parser-js
from 0.7.31
to 0.7.33
in /airflow/www
(#29172)pytest
(#29086)run_id
url param when linking to graph/gantt
views (#29066)python_callable
(#28932)swagger-ui-dist
from 3.52.0
to 4.1.3
in /airflow/www
(#28824)importlib-metadata
backport to < 5.0.0
(#29924, #30069)merge_data()
task (#29158)notes
param from TriggerDagRunOperator docstring (#29298)schedule
param rather than timetable
in Timetables docs (#29255)Published by jedcunningham over 1 year ago
bitnami/postgresql
subchart updated to 12.1.9
(#29071)The version of postgresql installed is still version 11.
If you are upgrading an existing helm release with the built-in postgres database, you will either need to delete your release and reinstall fresh, or manually delete these 2 objects:
kubectl delete secret {RELEASE_NAME}-postgresql
kubectl delete statefulset {RELEASE_NAME}-postgresql
As a reminder, it is recommended to set up an external database <https://airflow.apache.org/docs/helm-chart/stable/production-guide.html#database>
_ in production.
This version of the chart uses different variable names for setting usernames and passwords in the postgres database.
postgresql.auth.enablePostgresUser
is used to determine if the "postgres" admin account will be created.postgresql.auth.postgresPassword
sets the password for the "postgres" user.postgresql.auth.username
and postrgesql.auth.password
are used to set credentials for a non-admin account if desired.postgresql.postgresqlUsername
and postgresql.postresqlPassword
, which were used in the previous version of the chart, are no longer used.Users will need to make those changes in their values files if they are changing the Postgres configuration.
Previously the subchart version was 10.5.3
.
dags.gitSync.wait
reduced to 5
seconds (#27625)The default for dags.gitSync.wait
has been reduced from 60
seconds to 5
seconds to reduce the likelihood of DAGs
becoming inconsistent between Airflow components. This will, however, increase traffic to the remote git repository.
2.5.1
(#29074)The default Airflow image that is used with the Chart is now 2.5.1
, previously it was 2.4.1
.
3.6.3
(#27848)The default git-sync image that is used with the Chart is now 3.6.3
, previously it was 3.4.0
.
7-bullseye
(#27443)The default redis image that is used with the Chart is now 7-bullseye
, previously it was 6-bullseye
.
webserverConfigConfigMapName
(#27419)extraVolumeMounts
to sidecars too (#27420)bitnami/postgresql
subchart to 12.1.9 (#29071)Published by pierrejeambrun over 1 year ago
swagger-ui-dist
via npm package (#28788)UIAlert
should_show when AUTH_ROLE_PUBLIC
set (#28781)external_task_ids
of ExternalTaskSensor (#28692)DetachedInstanceError
when finding zombies in Dag Parsing process (#28198)divs
to fix dagid
copy nit on dag.html (#28643)setNote
endpoints under TaskInstance in OpenAPI (#28566)CronTriggerTimetable
(#28532)ensure_ascii=False
in trigger dag run API (#28451)ti._try_number
for deferred and up_for_reschedule tasks (#26993)callModal
from dag.js (#28410)monkeypatching
via environment variable (#28283)LazyXComAccess
(#28191)@dag
decorator are reported in dag file (#28153)dagbag_size
metric decreases when files are deleted (#28135)airflow.api.auth.backend.session
to backend sessions in compose (#28094)next_dagruns_to_examine
, add MySQL index hint (#27821)dnspython
after eventlet got fixed (#29004)dnspython
to < 2.3.0
until eventlet incompatibility is solved (#28962)SQLAlchemy
to below 2.0
(#28725)json5
from 1.0.1
to 1.0.2
in /airflow/www
(#28715)Enums
(#28627)Connection.get_extra
type (#28594)conf.get*
from the right source location (#28543)purge_inactive_dag_warnings
(#28481)test_task_command
to Pytest and unquarantine
tests in it (#28247)0.2.0
to 0.2.2
in /airflow/www
(#28080)subgraph
logic (#27987)map_index
(#27904)LocalTaskJob
(#27381)Published by ephraimbuddy almost 2 years ago
TaskRunner
: notify of component start and finish (#27855)AirflowModelViews(Variables/Connection)
(#24079, #27994, #27923)Is /not
Null filter for value is None on webui
(#26584)one_done
trigger rule (#26146)TI.xcom_pull()
with explicit task_ids and map_indexes (#27699)urlsplit
(#27389)branch_task_ids
into SkipMixin
(#27434).first()
to .scalar()
(#27323)howtos
about sensors (#27333)extra__conn_type__
prefix required for UI behaviors (#26995)crashloopbackoff
when using hostname_callable
(#24999)__future__
.annotations automatically by isort (#26383)V1Pod
in task callback (#27609)taskInstance
errors and split into two tables (#26575)autoregistered
DAGs if there are any import errors (#26398)from airflow import version
lazy import (#26239)is_mapped
attribute (#27881)airflow/callbacks/* airflow/cli/*
(#27721)airflow/api_connexion/* directory
(#27718)airflow/listener/* directory
(#27731)airflow/lineage/* directory
(#27732)airflow/api/*
directory (#27716)minimatch
from 3.0.4 to 3.0.8
in /airflow/www
(#27688)1.4.1 to 1.4.2
in /airflow/www
(#27697)BaseTrigger.run
(#27416)2022.10.1
(#27383)memray
files to gitignore / dockerignore
(#27001)sphinx-autoapi
(#26743)RTIF.delete_old_records()
(#26667)pyupgrade
edge cases (#26384)docker-compose.yaml
(#26726)Published by ephraimbuddy almost 2 years ago
SLAMiss
is nullable and not always given back when pulling task instances (#27423)_
when searching for DAGs (#27448)dag/task
ids from BaseExecutor (#27550)RotatingFilehandler
used in DagProcessor
non-caching (#27223)executor.job_id
to BackfillJob.id
for backfills (#27020)1.4.0
to 1.4.1
in /airflow/www
(#27552)TCP_KEEPALIVE
etc warnings (#26981)KubernetesExecutor
overwrites container args (#27450)BaseOperator
links (#27441)Dag Run
start. (#27111)kerberos
environment variables to the docs (#27028)Published by ephraimbuddy almost 2 years ago
airflow dags reserialize
(#27030)state_color_mapping
jinja global (#26822)airflow tasks test
(#26806)sphinx
and sphinx-autoapi
(#26743)RTIF.delete_old_records()
(#26667)4.1.4
(#26393)docker-compose.yaml
(#26726)Published by jedcunningham about 2 years ago
overrideMappings
in Helm chart values (#26598)podAnnotations
to StatsD deployment template (#25732)revisionHistoryLimit
to all deployments (#25059)podAnnotations
to Redis StatefulSet (#23708)flower_url_prefix
in Helm chart values (#26415)sql_alchemy_conn
for celery result backend when result_backend
is not set (#24496)imagePullPolicy
(#26423)sshKeySecret
if dag persistence is enabled (#22913)jobs check
command (#24480)--local
flag for liveness probes in Airflow 2.5+ (#24999)ssh://
prefix from git repo value (#26632)defaultAirflowRepository
comment (#26428)result_backend
, dag processor, and helm uninstall
(#24929)Published by jedcunningham about 2 years ago
Table.exists()
(#26616)templates_dict
to task decorator (#26390)scheduled
during backfill (#26205)json_provider_class
on Flask app so it uses our encoder (#26554)cacheable
(#26498)base_template
(#26439)non-sensitive-only
option for expose_config
(#26507)example_datasets
dag names (#26495)Published by ephraimbuddy about 2 years ago
@task.short_circuit
TaskFlow decorator (#25752)execution_date_or_run_id
optional in tasks test
command (#26114)DagProcessors
parsing files from different locations. (#25935)ExternalPythonOperator
(#25780)dags test
(#26111)expand_kwargs()
against a literal list (#25925)output
property to MappedOperator
(#25604)TaskGroup
in ExternalTaskSensor
(#24902)@task.kubernetes
taskflow decorator (#25663)schedule
param (#25410)CronTriggerTimetable
(#23662)XComArg.zip(*xcom_args)
(#25176)sla_miss
metric (#23402)map()
semantic (#25085)expand_kwargs()
(#24989)DagWarning
model, and a check for missing pools (#23317)ExternalTaskMarker
operator (#23964)SlaCallbackRequest
if the DAG is scheduled (#26089)Operator.output
more (#25617)hacky
double-rendering prevention in mapped task (#25924)DAG(schedule=...)
improvements (#25648)operator_name
dupe in serialized JSON (#25819)task_group_to_grid
(#25654)CronTriggerTimetable
(#25503)/grid
endpoint (#25481)@task.branch
decorator (#25242)audit_log
route (#25415)getTasks
from Grid view (#25359)@dag
arguments (#25044)SchedulerJob
and TaskInstance
(#24912)getfqdn
with more resilient version (#24981)NBSP
characters by whitespaces
(#24797)airflow db upgrade
(#24518)expand()
error vague so it's not misleading (#24018)[webserver]analytics_tool
(#24032)dttm
searchable field in audit log (#23794)execute_in_subprocess
(#23286)func.count
to count rows (#23657)sql_alchemy_conn
for celery result backend when result_backend
is not set (#24496)AirflowDagCycleException
message (#26204)TaskInstance.task
not defined before handle_failure
(#26040)DAGs
and Datasets
menu links based on role permission (#26183)TaskGroup
tooltip via function docstring (#26028)DagRun.start_date
not set during backfill with --reset-dagruns
True (#26135)mapped_task
is SKIPPED (#25995)TaskInstance
related endpoints to avoid API errors (#26076)BranchDateTimeOperator
to be timezone-awreness-insensitive
(#25944)list-mapped-task-instance
(#25965)iter_mapped_dependants
(#25793)/
in variable get endpoint (#25774)XComArg
fails to resolve (#25661)json
arg help in airflow variables set
command (#25726)ti_state
on find_zombies
query (#25725)axios
errors (#25703)dag_owner_attributes
table (#25579)expand_kwargs()
input type before unmapping (#25355)ExternalTaskSensor
not working with dynamic task (#25215)MappedOperator
members in sync with BaseOperator
(#24034)ERD
schema for the MetaData
DB (#26217)PEP562
(#26167)dag_edges
and task_group_to_dict
to corresponding util modules (#26212)ORM
after forking to run a DAG processor (#26216)PEP-562
getattr (#26153)BaseSerialization.serialize
"public" to other classes. (#26142)moment-timezone
from 0.5.34
to 0.5.35
in /airflow/www
(#26080)CamelCase
to generated operations types (#25887)SkipMixin
(#25864)undici
from 5.8.0 to 5.9.1
in /airflow/www (#25801)_BranchPythonDecoratedOperator
(#25783)filename_template
deprecation message (#25749)ParamSpec
to replace ...
in Callable (#25658)elasticsearch
test config to avoid warning on deprecated template (#25520)terser
from 4.8.0 to 4.8.1
in /airflow/ui (#25178)typescript
types from rest API
docs (#25123)typescript
(#25089)typescript
. (#25096)ts
(#25267)ts.
(#25074)ti
if it returns None (#25047)js
file structure (#25003)moment
from 2.29.3 to 2.29.4
in /airflow/www
(#24885)xcom_push
flag from BashOperator
(#24824)typescript
(#24715)charts.css
to chart.css
(#24531)grid.css
to chart.css
(#24529)set_new_process_group
utility (#24371)moto
version (#24222)[github_enterprise]
from ref docs (#24033)f-strings
in logging calls (#23597)JPype1
(#23847)Celery
Flower (#25986)MySQL
Charset problems (#25938)Trigger Rules
(#25840)task_instance_mutation_hook
usage (#25607)task-generated mapping
example (#23424)2.2.0
(#24413)Published by ephraimbuddy about 2 years ago
attrs
state management on MappedOperator
(#24772)pod_override
to JSON before pickling executor_config
(#24356)pid
check (#24636)airflow db reset
when dangling tables exist (#25441)disable_verify_ssl
behaviour (#25023)task_instance.state
in critical section query (#25673)TaskCallbackRequest
(#25471)__repr__
to ParamsDict class (#25305)TimeSensorAsync
target_time
to utc on call time (#25221)updateNodeLabels
after expandGroup
(#25217)DagProcessorManager
queue (#25147)invalidateQueries
call (#25097)airflow/www/package.json
: Add name, version fields. (#25065)IPv6
address (#24755) (#24846)%z
for %(asctime)s
to fix timezone for logs on UI (#24811)TriggerDagRunOperator.operator_extra_links
is attr (#24676)prohibit_commit
(#24366)external_executor_id
in sql_engine_collation_for_ids
docs (#25197)DR.task_instance_scheduling_decisions
(#24774)resolve_xcom_backend
function level documentation (#24965)Published by ephraimbuddy over 2 years ago
sensorinstance
(#24638)ti.task.dag
assignment back inside try/except
block (#24533) (#24592)FSHook
(#24470)stdout
for airflow tasks test
(#24362)DebugExecutor
use ti.run()
instead of ti._run_raw_task
(#24357)URI
constructor for MySQL
connection (#24320)scheduleinterval
nullable true added in openapi
(#24253)return_code
interface for task runner (#24093)op_kwargs
(#23860)ExternalTaskSensor
respects soft_fail
if the external task enters a failed_state
(#23647)StatD
timing metric units (#21106)cache_ok
flag to sqlalchemy TypeDecorators. (#24499)LOGGING_LEVEL=DEBUG
(#23360)grid_data
endpoint by 10x (#24284)TI.log_url
fix for map_index
(#24335)0080_2_0_2
- Replace null values before setting column not null (#24585)sql_alchemy_conn
if old Postgres schemes used (#24569)log_template
table (#24511)log_id_template
value (#24506)task_instance
(#24488)run_id
for grid group summaries (#24327)get_hostname
instead of socket.getfqdn
(#24260)useTasks
crash on error (#24152)use_task_execution_date
with use_task_logical_date
(#23983)REMOVED
to finished states and success states (#23797)dbapi.get_pandas_df
(#23452)schedule_interval
match timetable (#23113)jsx
files that affect run/task selection to tsx
(#24509)Content-Type
and chartset
on grid_data
endpoint (#24375)[core]
parallelism config setting (#23768)extras
and format Airflow Vars
/ Conns
(#24735)get_current_context()
chapter (#24482)log_id_template
(#24455)MSSQL
less than v2017
in code (#24095)3.6
compatibility objects/modules (#24048)api_connexion
(#24050)4.1.2
(#24619)markdown-it-py
(#19702)rich
to latest version across the board. (#24186)TimedJSONWebSignatureSerializer
(#24519)authlib
/ oauth
dependency (#24516)webpack
5 (#24485)typescript
(#24337)nbf
and aud
claims foryarn
test warnings (#24722)DagRun.verify_integrity
(#24114)4.1.1
(#24399)Flask-WTF 0.15
(#24621)Published by ephraimbuddy over 2 years ago
check_migration
loop at least onceis_mapped
field to Task response. (#23319)dag_tag
to dag
foreign key (#23444)--subdir
argument value for standalone dag processor. (#23864)dag-processor
command (#23886)__wrapped__
property to _TaskDecorator
(#23830)sql
is empty list in DbApiHook (#23816)_airflow_moved
tables (#23635)Published by ephraimbuddy over 2 years ago
CeleryExecutor
(#23690)dag-processor
fetch metadata database config (#23575)reschedule
to the serialized fields for the BaseSensorOperator
(#23674)execution_timeout
as timedelta (#23655)send_callback
method for CeleryKubernetesExecutor
and LocalKubernetesExecutor
(#23617)PythonVirtualenvOperator
templated_fields (#23559)root_dag_id
too (#23536)KubernetesJobWatcher
getting stuck on resource too old (#23521)moved
table exists (#23491)core__sql_alchemy_conn__cmd
(#23441)airflow dags show
for mapped operator (#23339)ti.mark_success_url
(#23330)<Time />
in Mapped Instance table (#23313)dag_processing.processor_timeouts
to counters section (#23393)expand()
and partial()
(#23373)