discovery: document connMu contract, distinguish no-connection error

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DCO

Backups - E2E - Next Release - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Backups - E2E - Next Release

Code Coverage on: pull_request 1

Code Coverage

Vitess Tester (vtgate) on: pull_request 1

Run endtoend tests on Vitess Tester (vtgate)

Backups - Manual - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Backups - Manual

Reparent New Vtctl - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Reparent New Vtctl

Docker Lite Build Check on: pull_request

Generate matrix

Build docker/lite/Dockerfile

Build docker/lite/Dockerfile.mysql80

Build docker/lite/Dockerfile.mysql84

Build docker/lite/Dockerfile.percona80

Build docker/lite/Dockerfile.percona84

Backups - E2E - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Backups - E2E

Query Serving (Queries - 2) - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Query Serving (Queries - 2)

local_example on: pull_request 4

Local example using etcd on Ubuntu

Local example using zk2 on Ubuntu

check_make_vtadmin_authz_testgen on: pull_request

Check Make vtadmin_authz_testgen

Cluster End-to-End Tests (tabletmanager_disk_health_monitor) on: pull_request 1

Run endtoend tests on Cluster (tabletmanager_disk_health_monitor)

e2e_race on: pull_request

End-to-End Test (Race)

Check Pull Request labels on: pull_request

Check Pull Request labels

Query Serving (Queries) Next Release - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Query Serving (Queries) Next Release

docker_ci on: pull_request 4

Java Docker Test

Docker Test Cluster

endtoend on: pull_request

End-to-End Test

Backups - Manual - Next Release - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Backups - Manual - Next Release

check_make_vtadmin_web_proto on: pull_request

Check Make VTAdmin Web Proto

Static Code Checks, Etc. on: pull_request 11

Static Code Checks Etc

Query Serving (Queries) - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Query Serving (Queries)

Reparent Old VTTablet - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Reparent Old VTTablet

Code Freeze on: pull_request

Code Freeze

Reparent New VTTablet - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Reparent New VTTablet

vtop_example on: pull_request

VTop Example

Reparent Old Vtctl - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Reparent Old Vtctl

Query Serving (Queries - 2) Next Release - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Query Serving (Queries - 2) Next Release

Online DDL flow - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Online DDL flow

Query Serving (Schema) Next Release - Upgrade Downgrade Testing on: pull_request

Run Upgrade Downgrade Test - Query Serving (Schema) Next Release

Cluster End-to-End Tests on: pull_request 1

generate-matrix

Run endtoend tests on Cluster (12)

Run endtoend tests on Cluster (13)

Run endtoend tests on Cluster (15)

Run endtoend tests on Cluster (18)

Run endtoend tests on Cluster (21)

Run endtoend tests on Cluster (backup_pitr)

Run endtoend tests on Cluster (backup_pitr_mysqlshell)

Run endtoend tests on Cluster (backup_pitr_xtrabackup)

Run endtoend tests on Cluster (ers_prs_newfeatures_heavy)

Run endtoend tests on Cluster (mysql84)

Run endtoend tests on Cluster (mysql_server_vault)

Run endtoend tests on Cluster (onlineddl_revert)

Run endtoend tests on Cluster (onlineddl_scheduler)

Run endtoend tests on Cluster (onlineddl_vrepl)

Run endtoend tests on Cluster (onlineddl_vrepl_stress)

Run endtoend tests on Cluster (onlineddl_vrepl_stress_suite)

Run endtoend tests on Cluster (onlineddl_vrepl_suite)

Run endtoend tests on Cluster (schemadiff_vrepl)

Run endtoend tests on Cluster (tabletmanager_consul)

Run endtoend tests on Cluster (tabletmanager_tablegc)

Run endtoend tests on Cluster (tabletmanager_throttler_topo)

Run endtoend tests on Cluster (topo_connection_cache)

Run endtoend tests on Cluster (vreplication_across_db_versions)

Run endtoend tests on Cluster (vreplication_basic)

Run endtoend tests on Cluster (vreplication_cellalias)

Run endtoend tests on Cluster (vreplication_copy_parallel)

Run endtoend tests on Cluster (vreplication_foreign_key_stress)

Run endtoend tests on Cluster (vreplication_mariadb_to_mysql)

Run endtoend tests on Cluster (vreplication_migrate)

Run endtoend tests on Cluster (vreplication_multi_tenant)

Run endtoend tests on Cluster (vreplication_partial_movetables_and_materialize)

Run endtoend tests on Cluster (vreplication_v2)

Run endtoend tests on Cluster (vreplication_vdiff2)

Run endtoend tests on Cluster (vreplication_vtctldclient_movetables_tz)

Run endtoend tests on Cluster (vstream)

Run endtoend tests on Cluster (vtbackup)

Run endtoend tests on Cluster (vtctlbackup_sharded_clustertest_heavy)

Run endtoend tests on Cluster (vtgate_concurrentdml)

Run endtoend tests on Cluster (vtgate_foreignkey_stress)

Run endtoend tests on Cluster (vtgate_gen4)

Run endtoend tests on Cluster (vtgate_general_heavy)

Run endtoend tests on Cluster (vtgate_godriver)

Run endtoend tests on Cluster (vtgate_partial_keyspace)

Run endtoend tests on Cluster (vtgate_plantests)

Run endtoend tests on Cluster (vtgate_queries)

Run endtoend tests on Cluster (vtgate_readafterwrite)

Run endtoend tests on Cluster (vtgate_reservedconn)

Run endtoend tests on Cluster (vtgate_schema)

Run endtoend tests on Cluster (vtgate_schema_tracker)

Run endtoend tests on Cluster (vtgate_tablet_healthcheck_cache)

Run endtoend tests on Cluster (vtgate_topo)

Run endtoend tests on Cluster (vtgate_topo_consul)

Run endtoend tests on Cluster (vtgate_topo_etcd)

Run endtoend tests on Cluster (vtgate_transaction)

Run endtoend tests on Cluster (vtgate_unsharded)

Run endtoend tests on Cluster (vtgate_vindex_heavy)

Run endtoend tests on Cluster (vtgate_vschema)

Run endtoend tests on Cluster (vtorc)

Run endtoend tests on Cluster (vttablet_prscomplex)

Run endtoend tests on Cluster (xb_backup)

Run endtoend tests on Cluster (xb_recovery)

Query Serving (Schema) - Upgrade Downgrade Testing on: pull_request 1

Run Upgrade Downgrade Test - Query Serving (Schema)

region_example on: pull_request 2

Region Sharding example using etcd on Ubuntu

Unit Test on: pull_request 14

Unit Test (mysql57)

Unit Test (evalengine_mysql57)

Unit Test (mysql80)

Unit Test (evalengine_mysql80)

Unit Test (mysql84)

Unit Test (evalengine_mysql84)

Unit Test (mysql80_arm64)

Unit Test (evalengine_mysql80_arm64)

Unit Test (Race)

Unit Test (Evalengine_Race)

Codecov

codecov/patch

codecov/project

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