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Keeper is shown as unhealthy/unknown, but keeper process thinks it is fine #911

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Open
Keeper is shown as unhealthy/unknown, but keeper process thinks it is fine#911
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bug
@nh2

Description

@nh2
nh2
opened on Jul 26, 2023

What happened:

Today we had a production outage of a couple minutes, suspectedly because our stolon cluster did not failover correctly.

I manually fixed the problem by restarting a keeper, but another keeper is still in an unhealthy state from the cluster's perspective, while the keeper itself seems to think that it is fine.

stolonctl status shows keeper node_6 as HEALTHY = false, PG HEALTHY = false, and PG LISTENADDRESS = (unknown):

Click to expand full `stolonctl status` output 
# stolonctl status               
=== Active sentinels ===

ID    LEADER
778771af false
7c12d47f false
bfe3a503 true
d5cd2ad2 false

=== Active proxies ===

ID
26803fc5
295e41dc
62ae83e9
651751d3
c431e17d
c939976b
e0d69a43

=== Keepers ===

UID      HEALTHY  PG LISTENADDRESS  PG HEALTHY  PG WANTEDGENERATION  PG CURRENTGENERATION
node_4  true  10.0.0.4:5432     true     2        2  
node_5  true  10.0.0.5:5432  true  5  5  
node_6  false (unknown)   false 2  0  

=== Cluster Info ===

Master Keeper: node_5

===== Keepers/DB tree =====

node_5 (master)
├─node_6
└─node_4

For reading convenience, Keepers formatted nicely:

=== Keepers ===

UID      HEALTHY  PG LISTENADDRESS  PG HEALTHY  PG WANTEDGENERATION  PG CURRENTGENERATION
node_4  true      10.0.0.4:5432     true        2                    2  
node_5  true      10.0.0.5:5432     true        5                    5  
node_6  false     (unknown)         false       2                    0
Click to expand full `stolonctl spec` output 
{
   "sleepInterval": "2s",
   "requestTimeout": "4s",
   "failInterval": "8s",
   "synchronousReplication": true,
   "minSynchronousStandbys": 1,
   "maxSynchronousStandbys": 2,
   "usePgrewind": true,
   "initMode": "new",
   "pgParameters": {
      "datestyle": "iso, mdy",
      "default_text_search_config": "pg_catalog.english",
      "dynamic_shared_memory_type": "posix",
      "lc_messages": "en_US.UTF-8",
      "lc_monetary": "en_US.UTF-8",
      "lc_numeric": "en_US.UTF-8",
      "lc_time": "en_US.UTF-8",
      "log_min_duration_statement": "10",
      "log_timezone": "UTC",
      "logging_collector": "on",
      "max_connections": "100",
      "max_wal_size": "1GB",
      "min_wal_size": "80MB",
      "random_page_cost": "1.1",
      "shared_buffers": "128MB",
      "timezone": "UTC",
      "wal_level": "replica",
      "work_mem": "65536"
   }
}
Click to expand full `stolonctl clusterdata read | jq .` output 
{
  "formatVersion": 1,
  "changeTime": "2023-07-26T12:41:50.048697008Z",
  "cluster": {
    "uid": "735e8856",
    "generation": 1,
    "changeTime": "2023-07-26T11:41:07.029419632Z",
    "spec": {
      "sleepInterval": "2s",
      "requestTimeout": "4s",
      "failInterval": "8s",
      "synchronousReplication": true,
      "minSynchronousStandbys": 1,
      "maxSynchronousStandbys": 2,
      "additionalWalSenders": null,
      "additionalMasterReplicationSlots": null,
      "usePgrewind": true,
      "initMode": "new",
      "pgParameters": {
        "datestyle": "iso, mdy",
        "default_text_search_config": "pg_catalog.english",
        "dynamic_shared_memory_type": "posix",
        "lc_messages": "en_US.UTF-8",
        "lc_monetary": "en_US.UTF-8",
        "lc_numeric": "en_US.UTF-8",
        "lc_time": "en_US.UTF-8",
        "log_min_duration_statement": "10",
        "log_timezone": "UTC",
        "logging_collector": "on",
        "max_connections": "100",
        "max_wal_size": "1GB",
        "min_wal_size": "80MB",
        "random_page_cost": "1.1",
        "shared_buffers": "128MB",
        "timezone": "UTC",
        "wal_level": "replica",
        "work_mem": "65536"
      },
      "pgHBA": null,
      "automaticPgRestart": null
    },
    "status": {
      "phase": "normal",
      "master": "3397fb23"
    }
  },
  "keepers": {
    "node_4": {
      "uid": "node_4",
      "generation": 1,
      "changeTime": "2023-07-26T12:41:50.048761009Z",
      "spec": {},
      "status": {
        "healthy": true,
        "lastHealthyTime": "2023-07-26T12:41:50.046055293Z",
        "bootUUID": "e687f779-361c-4213-a5f4-157f352ed63a",
        "postgresBinaryVersion": {
          "Maj": 14,
          "Min": 1
        },
        "canBeMaster": true,
        "canBeSynchronousReplica": true
      }
    },
    "node_5": {
      "uid": "node_5",
      "generation": 1,
      "changeTime": "2023-07-26T12:41:50.048755779Z",
      "spec": {},
      "status": {
        "healthy": true,
        "lastHealthyTime": "2023-07-26T12:41:50.046055443Z",
        "bootUUID": "9b604f18-c48a-42f4-a774-cd49795e0e89",
        "postgresBinaryVersion": {
          "Maj": 14,
          "Min": 1
        },
        "canBeMaster": true,
        "canBeSynchronousReplica": true
      }
    },
    "node_6": {
      "uid": "node_6",
      "generation": 1,
      "changeTime": "2023-07-24T14:10:46.921750869Z",
      "spec": {},
      "status": {
        "lastHealthyTime": "2023-07-24T14:10:44.902643198Z",
        "bootUUID": "2c4a6ad5-1ed8-4a55-aa25-0c30cb2a4acc",
        "postgresBinaryVersion": {
          "Maj": 14,
          "Min": 1
        },
        "canBeMaster": true,
        "canBeSynchronousReplica": true
      }
    }
  },
  "dbs": {
    "32e06e90": {
      "uid": "32e06e90",
      "generation": 2,
      "changeTime": "2023-07-26T11:41:11.057249694Z",
      "spec": {
        "keeperUID": "node_6",
        "requestTimeout": "4s",
        "maxStandbys": 20,
        "usePgrewind": true,
        "additionalWalSenders": 5,
        "additionalReplicationSlots": null,
        "initMode": "resync",
        "pgParameters": {
          "datestyle": "iso, mdy",
          "default_text_search_config": "pg_catalog.english",
          "dynamic_shared_memory_type": "posix",
          "lc_messages": "en_US.UTF-8",
          "lc_monetary": "en_US.UTF-8",
          "lc_numeric": "en_US.UTF-8",
          "lc_time": "en_US.UTF-8",
          "log_min_duration_statement": "10",
          "log_timezone": "UTC",
          "logging_collector": "on",
          "max_connections": "100",
          "max_wal_size": "1GB",
          "min_wal_size": "80MB",
          "random_page_cost": "1.1",
          "shared_buffers": "128MB",
          "timezone": "UTC",
          "wal_level": "replica",
          "work_mem": "65536"
        },
        "pgHBA": null,
        "role": "standby",
        "followConfig": {
          "type": "internal",
          "dbuid": "3397fb23"
        },
        "followers": [],
        "synchronousStandbys": null,
        "externalSynchronousStandbys": null
      },
      "status": {
        "synchronousStandbys": null
      }
    },
    "3397fb23": {
      "uid": "3397fb23",
      "generation": 5,
      "changeTime": "2023-07-26T12:41:50.048753905Z",
      "spec": {
        "keeperUID": "node_5",
        "requestTimeout": "4s",
        "maxStandbys": 20,
        "synchronousReplication": true,
        "usePgrewind": true,
        "additionalWalSenders": 5,
        "additionalReplicationSlots": null,
        "initMode": "none",
        "pgParameters": {
          "datestyle": "iso, mdy",
          "default_text_search_config": "pg_catalog.english",
          "dynamic_shared_memory_type": "posix",
          "lc_messages": "en_US.UTF-8",
          "lc_monetary": "en_US.UTF-8",
          "lc_numeric": "en_US.UTF-8",
          "lc_time": "en_US.UTF-8",
          "log_min_duration_statement": "10",
          "log_timezone": "UTC",
          "logging_collector": "on",
          "max_connections": "100",
          "max_wal_size": "1GB",
          "min_wal_size": "80MB",
          "random_page_cost": "1.1",
          "shared_buffers": "128MB",
          "timezone": "UTC",
          "wal_level": "replica",
          "work_mem": "65536"
        },
        "pgHBA": null,
        "role": "master",
        "followers": [
          "32e06e90",
          "c6cb2f35"
        ],
        "synchronousStandbys": [
          "c6cb2f35"
        ],
        "externalSynchronousStandbys": []
      },
      "status": {
        "healthy": true,
        "currentGeneration": 5,
        "listenAddress": "10.0.0.5",
        "port": "5432",
        "systemdID": "7191260299357525396",
        "timelineID": 31,
        "xLogPos": 411870652720,
        "timelinesHistory": [
          {
            "timelineID": 29,
            "switchPoint": 365271653264,
            "reason": "no recovery target specified"
          },
          {
            "timelineID": 30,
            "switchPoint": 409000508648,
            "reason": "no recovery target specified"
          }
        ],
        "pgParameters": {
          "datestyle": "iso, mdy",
          "default_text_search_config": "pg_catalog.english",
          "dynamic_shared_memory_type": "posix",
          "lc_messages": "en_US.UTF-8",
          "lc_monetary": "en_US.UTF-8",
          "lc_numeric": "en_US.UTF-8",
          "lc_time": "en_US.UTF-8",
          "log_min_duration_statement": "10",
          "log_timezone": "UTC",
          "logging_collector": "on",
          "max_connections": "100",
          "max_wal_size": "1GB",
          "min_wal_size": "80MB",
          "random_page_cost": "1.1",
          "shared_buffers": "128MB",
          "timezone": "UTC",
          "wal_level": "replica",
          "work_mem": "65536"
        },
        "synchronousStandbys": [
          "c6cb2f35"
        ],
        "olderWalFile": "0000001F0000005F000000D1"
      }
    },
    "c6cb2f35": {
      "uid": "c6cb2f35",
      "generation": 2,
      "changeTime": "2023-07-26T12:41:50.048725131Z",
      "spec": {
        "keeperUID": "node_4",
        "requestTimeout": "4s",
        "maxStandbys": 20,
        "usePgrewind": true,
        "additionalWalSenders": 5,
        "additionalReplicationSlots": null,
        "initMode": "none",
        "pgParameters": {
          "datestyle": "iso, mdy",
          "default_text_search_config": "pg_catalog.english",
          "dynamic_shared_memory_type": "posix",
          "lc_messages": "en_US.UTF-8",
          "lc_monetary": "en_US.UTF-8",
          "lc_numeric": "en_US.UTF-8",
          "lc_time": "en_US.UTF-8",
          "log_min_duration_statement": "10",
          "log_timezone": "UTC",
          "logging_collector": "on",
          "max_connections": "100",
          "max_wal_size": "1GB",
          "min_wal_size": "80MB",
          "random_page_cost": "1.1",
          "shared_buffers": "128MB",
          "timezone": "UTC",
          "wal_level": "replica",
          "work_mem": "65536"
        },
        "pgHBA": null,
        "role": "standby",
        "followConfig": {
          "type": "internal",
          "dbuid": "3397fb23"
        },
        "followers": [],
        "synchronousStandbys": null,
        "externalSynchronousStandbys": null
      },
      "status": {
        "healthy": true,
        "currentGeneration": 2,
        "listenAddress": "10.0.0.4",
        "port": "5432",
        "systemdID": "7191260299357525396",
        "timelineID": 31,
        "xLogPos": 411870652048,
        "timelinesHistory": [
          {
            "timelineID": 29,
            "switchPoint": 365271653264,
            "reason": "no recovery target specified"
          },
          {
            "timelineID": 30,
            "switchPoint": 409000508648,
            "reason": "no recovery target specified"
          }
        ],
        "pgParameters": {
          "datestyle": "iso, mdy",
          "default_text_search_config": "pg_catalog.english",
          "dynamic_shared_memory_type": "posix",
          "lc_messages": "en_US.UTF-8",
          "lc_monetary": "en_US.UTF-8",
          "lc_numeric": "en_US.UTF-8",
          "lc_time": "en_US.UTF-8",
          "log_min_duration_statement": "10",
          "log_timezone": "UTC",
          "logging_collector": "on",
          "max_connections": "100",
          "max_wal_size": "1GB",
          "min_wal_size": "80MB",
          "random_page_cost": "1.1",
          "shared_buffers": "128MB",
          "timezone": "UTC",
          "wal_level": "replica",
          "work_mem": "65536"
        },
        "synchronousStandbys": null,
        "olderWalFile": "0000001F0000005F000000C5"
      }
    }
  },
  "proxy": {
    "generation": 430,
    "changeTime": "2023-07-26T11:41:13.06941116Z",
    "spec": {
      "masterDbUid": "3397fb23",
      "enabledProxies": [
        "26803fc5",
        "295e41dc",
        "62ae83e9",
        "651751d3",
        "c431e17d",
        "c939976b",
        "e0d69a43"
      ]
    },
    "status": {}
  }
}

Relevant here is

    "node_6": {
      "status": {
        "lastHealthyTime": "2023-07-24T14:10:44.902643198Z",

The stolon-keeper seems to be running fine according to systemctl status stolon-keeper.service:

Details 
● stolon-keeper.service
     Loaded: loaded (/etc/systemd/system/stolon-keeper.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2023-04-29 11:39:35 UTC; 2 months 27 days ago
   Main PID: 2105 (keeper)
         IP: 859.8G in, 11.9T out
         IO: 6.8T read, 2.7T written
      Tasks: 32 (limit: 154456)
     Memory: 1.5G
        CPU: 6d 23h 5min 51.631s
     CGroup: /system.slice/stolon-keeper.service
             ├─   2105 /nix/store/61syngpz7igk7hh84fcpxn1ywpdgbprb-stolon/bin/keeper --cluster-name stolon-cluster --store-backend=consul --uid node_6 --data-dir /var/lib/postgres/node_6 --pg-listen-address=10.0.0.6 --pg-bin-path=/nix/store/swc4d2nvp800dibijq0>
             ├─3516988 /nix/store/swc4d2nvp800dibijq09ksbw26nwg6yp-postgresql-14.1/bin/postgres -D /var/lib/postgres/node_6/postgres -c unix_socket_directories=/tmp
             ├─3516989 "postgres: logger " "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ">
             ├─3516990 "postgres: startup recovering 0000001F0000005F000000AF waiting" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "">
             ├─3516991 "postgres: checkpointer " "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ">
             ├─3516992 "postgres: background writer " "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "">
             ├─3516993 "postgres: stats collector " "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" ">
             ├─3517052 "postgres: walreceiver streaming 5F/AFACADF8" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "">
             └─3542888 "postgres: postgres postgres 10.0.0.6(43110) COPY" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" "" >

Jul 26 12:20:19 node-6 keeper[2105]: 2023-07-26T12:20:19.821Z        INFO        cmd/keeper.go:1676        postgres parameters not changed
Jul 26 12:20:19 node-6 keeper[2105]: 2023-07-26T12:20:19.821Z        INFO        cmd/keeper.go:1703        postgres hba entries not changed
Jul 26 12:20:21 node-6 keeper[2105]: 2023-07-26T12:20:21.851Z        INFO        cmd/keeper.go:1557        our db requested role is standby        {"followedDB": "3397fb23"}
Jul 26 12:20:21 node-6 keeper[2105]: 2023-07-26T12:20:21.851Z        INFO        cmd/keeper.go:1576        already standby
Jul 26 12:20:21 node-6 keeper[2105]: 2023-07-26T12:20:21.865Z        INFO        cmd/keeper.go:1676        postgres parameters not changed
Jul 26 12:20:21 node-6 keeper[2105]: 2023-07-26T12:20:21.866Z        INFO        cmd/keeper.go:1703        postgres hba entries not changed
Jul 26 12:20:23 node-6 keeper[2105]: 2023-07-26T12:20:23.895Z        INFO        cmd/keeper.go:1557        our db requested role is standby        {"followedDB": "3397fb23"}
Jul 26 12:20:23 node-6 keeper[2105]: 2023-07-26T12:20:23.895Z        INFO        cmd/keeper.go:1576        already standby
Jul 26 12:20:23 node-6 keeper[2105]: 2023-07-26T12:20:23.913Z        INFO        cmd/keeper.go:1676        postgres parameters not changed
Jul 26 12:20:23 node-6 keeper[2105]: 2023-07-26T12:20:23.913Z        INFO        cmd/keeper.go:1703        postgres hba entries not changed

Its logs show some earlier errors while pg_rewind was copying data over, but no indication that anything failed permanently:

Relevant sections:

Jul 24 14:10:35 node-6 keeper[2105]: 2023-07-24T14:10:35.171Z        INFO        cmd/keeper.go:1543        already master
Jul 24 14:10:35 node-6 keeper[2105]: 2023-07-24T14:10:35.176Z        INFO        cmd/keeper.go:997        dropping replication slot        {"slot": "stolon_93596109"}
Jul 24 14:10:35 node-6 keeper[2105]: 2023-07-24T14:10:35.182Z        INFO        cmd/keeper.go:997        dropping replication slot        {"slot": "stolon_97eba8d4"}
Jul 24 14:10:35 node-6 keeper[2105]: 2023-07-24T14:10:35.195Z        INFO        cmd/keeper.go:1676        postgres parameters not changed
Jul 24 14:10:35 node-6 keeper[2105]: 2023-07-24T14:10:35.195Z        INFO        cmd/keeper.go:1703        postgres hba entries not changed
Jul 24 14:10:37 node-6 keeper[2105]: 2023-07-24T14:10:37.212Z        INFO        cmd/keeper.go:1141        current db UID different than cluster data db UID        {"db": "cbcb41e1", "cdDB": "32e06e90"}
Jul 24 14:10:37 node-6 keeper[2105]: 2023-07-24T14:10:37.212Z        INFO        cmd/keeper.go:1296        resyncing the database cluster
Jul 24 14:10:37 node-6 keeper[2105]: 2023-07-24T14:10:37.213Z        INFO        postgresql/postgresql.go:384        stopping database
Jul 24 14:10:37 node-6 keeper[1690207]: waiting for server to shut down....
Jul 24 14:10:37 node-6 keeper[2105]: 2023-07-24T14:10:37.276Z        ERROR        cmd/keeper.go:720        cannot get configured pg parameters        {"error": "dial unix /tmp/.s.PGSQL.5432: connect: no such file or directory"}
Jul 24 14:10:37 node-6 keeper[1690207]:  done
Jul 24 14:10:37 node-6 keeper[1690207]: server stopped
Jul 24 14:10:37 node-6 keeper[2105]: 2023-07-24T14:10:37.324Z        INFO        cmd/keeper.go:899        syncing using pg_rewind        {"masterDB": "97eba8d4", "keeper": "node_4"}
Jul 24 14:10:37 node-6 keeper[2105]: 2023-07-24T14:10:37.325Z        INFO        postgresql/postgresql.go:921        running pg_rewind
Jul 24 14:10:37 node-6 keeper[1690211]: pg_rewind: fetched file "global/pg_control", length 8192
Jul 24 14:10:37 node-6 keeper[1690211]: pg_rewind: fetched file "pg_wal/0000001E.history", length 1289
Jul 24 14:10:37 node-6 keeper[1690211]: pg_rewind: Source timeline history:
Jul 24 14:10:37 node-6 keeper[1690211]: pg_rewind: Target timeline history:
Jul 24 14:10:37 node-6 keeper[1690211]: pg_rewind: 1: 0/0 - 5/B8C7E6D0
...
Jul 24 14:11:18 node-6 keeper[1690211]: pg_rewind: fetched file "global/pg_control", length 8192
Jul 24 14:11:18 node-6 keeper[2105]: 2023-07-24T14:11:18.308Z        ERROR        cmd/keeper.go:720        cannot get configured pg parameters        {"error": "dial unix /tmp/.s.PGSQL.5432: connect: no such file or directory"}
Jul 24 14:11:19 node-6 keeper[2105]: 2023-07-24T14:11:19.309Z        ERROR        cmd/keeper.go:720        cannot get configured pg parameters        {"error": "dial unix /tmp/.s.PGSQL.5432: connect: no such file or directory"}
Jul 24 14:11:20 node-6 keeper[2105]: 2023-07-24T14:11:20.310Z        ERROR        cmd/keeper.go:720        cannot get configured pg parameters        {"error": "dial unix /tmp/.s.PGSQL.5432: connect: no such file or directory"}
Jul 24 14:11:20 node-6 keeper[1690211]: pg_rewind: Done!
Jul 24 14:11:20 node-6 keeper[2105]: 2023-07-24T14:11:20.342Z        INFO        postgresql/postgresql.go:844        writing standby signal file
Jul 24 14:11:20 node-6 keeper[2105]: 2023-07-24T14:11:20.342Z        INFO        postgresql/postgresql.go:319        starting database
Jul 24 14:11:20 node-6 keeper[1690299]: 2023-07-24 14:11:20.352 UTC [1690299] LOG:  redirecting log output to logging collector process
Jul 24 14:11:20 node-6 keeper[1690299]: 2023-07-24 14:11:20.352 UTC [1690299] HINT:  Future log output will appear in directory "log".
Jul 24 14:11:20 node-6 keeper[2105]: 2023-07-24T14:11:20.600Z        INFO        cmd/keeper.go:1557        our db requested role is standby        {"followedDB": "97eba8d4"}
Jul 24 14:11:20 node-6 keeper[2105]: 2023-07-24T14:11:20.600Z        INFO        cmd/keeper.go:1576        already standby

What you expected to happen:

  • Either stolonctl status finds that the keeper is up and working, or
  • The keeper logs point out that there's a problem, and what it is. If it

How to reproduce it (as minimally and precisely as possible):

Unclear.

Stolon had been running uninterrupted for 2 months until this happened.

Environment:

  • Stolon version: Stolon master commit 4bb4107

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