We are using an old-style attribute declaration here because otherwise it is not possible to override \\__new\\__ method. Without it the _workers_ by default gets always the same  https://docs.python.org/3/library/stdtypes.html#dict[`+dict+`] object that could be mutated.
+
Consists of the following fields:
+
Variables:;;
+
_property \\___permanent_logical_slots_:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]]_link:#patroni.dcs.Cluster.\\__permanent_logical_slots[];;
  Dictionary of permanent `+logical+` replication slots.
+
_property \\___permanent_physical_slots_:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]]_link:#patroni.dcs.Cluster.\\__permanent_physical_slots[];;
  Dictionary of permanent `+physical+` replication slots.
+
_property \\___permanent_slots_:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]] |  https://docs.python.org/3/library/typing.html#typing.Any[Any]]_link:#patroni.dcs.Cluster.\\__permanent_slots[];;
  Dictionary of permanent replication slots with their known LSN.
+
_get_members_slots(_my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _role:  https://docs.python.org/3/library/stdtypes.html#str[str]_) →  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/stdtypes.html#str[str]]] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1144-L1185[View on GitHub]link:#patroni.dcs.Cluster._get_members_slots[];;
  Get physical replication slots configuration for members that sourcing from this node.
  +
  If the `+replicatefrom+` tag is set on the member - we should not create the replication slot for it on the current primary, because that member would replicate from elsewhere. We still create the slot if the `+replicatefrom+` destination member is currently not a member of the cluster (fallback to the primary), or if `+replicatefrom+` destination member happens to be the current primary.
  +
  Will log an error if:
  +
  \\__\\__
  \\__\\__
  +
  Parameters:::
  Returns:::
    dictionary of physical replication slots that should exist on a given node.
+
_get_permanent_slots(_*_, _is_standby_cluster:  https://docs.python.org/3/library/functions.html#bool[bool]_, _role:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _nofailover:  https://docs.python.org/3/library/functions.html#bool[bool]_, _major_version:  https://docs.python.org/3/library/functions.html#int[int]_) →  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1113-L1142[View on GitHub]link:#patroni.dcs.Cluster._get_permanent_slots[];;
  Get configured permanent replication slots.
  +
  Note

Permanent replication slots are only considered if `+use_slots+` configuration is enabled. A node that is not supposed to become a leader (_nofailover_) will not have permanent replication slots.

In a standby cluster we only support physical replication slots.

  The returned dictionary for a non-standby cluster always contains permanent logical replication slots in order to show a warning if they are not supported by PostgreSQL before v11.
  +
  Parameters:::
  Returns:::
    dictionary of permanent slot names mapped to attributes.
+
_has_permanent_logical_slots(_my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _nofailover:  https://docs.python.org/3/library/functions.html#bool[bool]_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1232-L1241[View on GitHub]link:#patroni.dcs.Cluster._has_permanent_logical_slots[];;
  Check if the given member node has permanent `+logical+` replication slots configured.
  +
  Parameters:::
  Returns:::
    `+True+` if any detected replications slots are `+logical+`, otherwise `+False+`.
+
_merge_permanent_slots(_slots:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/stdtypes.html#str[str]]]_, _permanent_slots:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]]_, _my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _major_version:  https://docs.python.org/3/library/functions.html#int[int]_) →  https://docs.python.org/3/library/typing.html#typing.List[List][ https://docs.python.org/3/library/stdtypes.html#str[str]] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1065-L1111[View on GitHub]link:#patroni.dcs.Cluster._merge_permanent_slots[];;
  Merge replication _slots_ for members with _permanent_slots_.
  +
  Perform validation of configured permanent slot name, skipping invalid names.
  +
  Will update _slots_ in-line based on `+type+` of slot, `+physical+` or `+logical+`, and name of node. Type is assumed to be `+physical+` if there are no attributes stored as the slot value.
  +
  Parameters:::
  Returns:::
    List of disabled permanent, logical slot names, if postgresql version < 11.
+
_static _empty() → link:#patroni.dcs.Cluster[Cluster] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L892-L895[View on GitHub]link:#patroni.dcs.Cluster.empty[];;
  Produce an empty link:#patroni.dcs.Cluster[`+Cluster+`] instance.
+
filter_permanent_slots(_slots:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/functions.html#int[int]]_, _is_standby_cluster:  https://docs.python.org/3/library/functions.html#bool[bool]_, _major_version:  https://docs.python.org/3/library/functions.html#int[int]_) →  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/functions.html#int[int]] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1208-L1230[View on GitHub]link:#patroni.dcs.Cluster.filter_permanent_slots[];;
  Filter out all non-permanent slots from provided _slots_ dict.
  +
  Parameters:::
  Returns:::
    a  https://docs.python.org/3/library/stdtypes.html#dict[`+dict+`] object that contains only slots that are known to be permanent.
+
get_clone_member(_exclude_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_) → link:#patroni.dcs.Member[Member] | link:#patroni.dcs.Leader[Leader] |  https://docs.python.org/3/library/constants.html#None[None] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L961-L972[View on GitHub]link:#patroni.dcs.Cluster.get_clone_member[];;
  Get member or leader object to use as clone source.
  +
  Parameters:::
    *exclude_name* – name of a member name to exclude.
  Returns:::
    a randomly selected candidate member from available running members that are configured to as viable sources for cloning (has tag `+clonefrom+` in configuration). If no member is appropriate the current leader is used.
+
get_member(_member_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _fallback_to_leader:  https://docs.python.org/3/library/functions.html#bool[bool] = True_) → link:#patroni.dcs.Member[Member] | link:#patroni.dcs.Leader[Leader] |  https://docs.python.org/3/library/constants.html#None[None] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L950-L959[View on GitHub]link:#patroni.dcs.Cluster.get_member[];;
  Get link:#patroni.dcs.Member[`+Member+`] object by name or the link:#patroni.dcs.Leader[`+Leader+`].
  +
  Parameters:::
  Returns:::
    the link:#patroni.dcs.Member[`+Member+`] if found or link:#patroni.dcs.Leader[`+Leader+`] object.
+
get_my_slot_name_on_primary(_my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _replicatefrom:  https://docs.python.org/3/library/stdtypes.html#str[str] |  https://docs.python.org/3/library/constants.html#None[None]_) →  https://docs.python.org/3/library/stdtypes.html#str[str] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1263-L1279[View on GitHub]link:#patroni.dcs.Cluster.get_my_slot_name_on_primary[];;
  Canonical slot name for physical replication.
  +
  Note

P <– I <– L

  In case of cascading replication we have to check not our physical slot, but slot of the replica that connects us to the primary.
  +
  Parameters:::
  Returns:::
    The slot name that is in use for physical replication on this no`de.
+
get_replication_slots(_my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _role:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _nofailover:  https://docs.python.org/3/library/functions.html#bool[bool]_, _major_version:  https://docs.python.org/3/library/functions.html#int[int]_, _*_, _is_standby_cluster:  https://docs.python.org/3/library/functions.html#bool[bool] = False_, _show_error:  https://docs.python.org/3/library/functions.html#bool[bool] = False_) →  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]]] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1033-L1063[View on GitHub]link:#patroni.dcs.Cluster.get_replication_slots[];;
  Lookup configured slot names in the DCS, report issues found and merge with permanent slots.
  +
  Will log an error if:
  +
  \\__\\__
  \\__\\__
  +
  Parameters:::
  Returns:::
    final dictionary of slot names, after merging with permanent slots and performing sanity checks.
+
has_member(_member_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L941-L948[View on GitHub]link:#patroni.dcs.Cluster.has_member[];;
  Check if the given member name is present in the cluster.
  +
  Parameters:::
    *member_name* – name to look up in the `+members+`.
  Returns:::
    `+True+` if the member name is found.
+
has_permanent_slots(_my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _*_, _is_standby_cluster:  https://docs.python.org/3/library/functions.html#bool[bool] = False_, _nofailover:  https://docs.python.org/3/library/functions.html#bool[bool] = False_, _major_version:  https://docs.python.org/3/library/functions.html#int[int] = 110000_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1187-L1206[View on GitHub]link:#patroni.dcs.Cluster.has_permanent_slots[];;
  Check if the given member node has permanent replication slots configured.
  +
  Parameters:::
  Returns:::
    `+True+` if there are permanent replication slots configured, otherwise `+False+`.
+
is_empty() https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L897-L904[View on GitHub]link:#patroni.dcs.Cluster.is_empty[];;
  Validate definition of all attributes of this link:#patroni.dcs.Cluster[`+Cluster+`] instance.
  +
  Returns:::
    `+True+` if all attributes of the current link:#patroni.dcs.Cluster[`+Cluster+`] are unpopulated.
+
_static _is_logical_slot(_value:  https://docs.python.org/3/library/typing.html#typing.Any[Any] |  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]]_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L984-L994[View on GitHub]link:#patroni.dcs.Cluster.is_logical_slot[];;
  Check whether provided configuration is for permanent logical replication slot.
  +
  Parameters:::
    *value* – configuration of the permanent replication slot.
  Returns:::
    `+True+` if _value_ is a logical replication slot, otherwise `+False+`.
+
_static _is_physical_slot(_value:  https://docs.python.org/3/library/typing.html#typing.Any[Any] |  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]]_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L974-L982[View on GitHub]link:#patroni.dcs.Cluster.is_physical_slot[];;
  Check whether provided configuration is for permanent physical replication slot.
  +
  Parameters:::
    *value* – configuration of the permanent replication slot.
  Returns:::
    `+True+` if _value_ is a physical replication slot, otherwise `+False+`.
+
is_unlocked() →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L934-L939[View on GitHub]link:#patroni.dcs.Cluster.is_unlocked[];;
  Check if the cluster does not have the leader.
  +
  Returns:::
    `+True+` if a leader name is not defined.
+
_property _last_lsn_:  https://docs.python.org/3/library/functions.html#int[int]_link:#patroni.dcs.Cluster.last_lsn[];;
  Last known leader LSN.
+
_property _leader_name_:  https://docs.python.org/3/library/stdtypes.html#str[str] |  https://docs.python.org/3/library/constants.html#None[None]_link:#patroni.dcs.Cluster.leader_name[];;
  The name of the leader if defined otherwise `+None+`.
+
_property _min_version_:  https://docs.python.org/3/library/typing.html#typing.Tuple[Tuple][ https://docs.python.org/3/library/functions.html#int[int], ...] |  https://docs.python.org/3/library/constants.html#None[None]_link:#patroni.dcs.Cluster.min_version[];;
  Lowest Patroni software version found in known members of the cluster.
+
should_enforce_hot_standby_feedback(_my_name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _nofailover:  https://docs.python.org/3/library/functions.html#bool[bool]_) →  https://docs.python.org/3/library/functions.html#bool[bool] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L1243-L1261[View on GitHub]link:#patroni.dcs.Cluster.should_enforce_hot_standby_feedback[];;
  Determine whether `+hot_standby_feedback+` should be enabled for the given member.
  +
  The `+hot_standby_feedback+` must be enabled if the current replica has `+logical+` slots, or it is working as a cascading replica for the other node that has `+logical+` slots.
  +
  Parameters:::
  Returns:::
    `+True+` if this node or any member replicating from this node has permanent logical slots, otherwise `+False+`.
+
_property _slots_:  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/functions.html#int[int]] |  https://docs.python.org/3/library/constants.html#None[None]_link:#patroni.dcs.Cluster.slots[];;
  `+{"slot_name":+``+ +``+int}+`.
  +
  Type:::
    State of permanent replication slots on the primary in the format
+
_property _timeline_:  https://docs.python.org/3/library/functions.html#int[int]_link:#patroni.dcs.Cluster.timeline[];;
  Get the cluster history index from the `+history+`.
  +
  Returns:::
    If the recorded history is empty assume timeline is `+1+`, if it is not defined or the stored history is not formatted as expected `+0+` is returned and an error will be logged. Otherwise, the last number stored incremented by 1 is returned.
  Example:::
    No history provided: >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, 0, None, \{}).timeline 0
    +
    Empty history assume timeline is `+1+`: >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, TimelineHistory.from_node(1, ‘[]’), None, \{}).timeline 1
    +
    Invalid history format, a string of `+a+`, returns `+0+`: >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, TimelineHistory.from_node(1, ‘[[“a”]]’), None, \{}).timeline 0
    +
    History as a list of strings: >>> history = TimelineHistory.from_node(1, ‘[[“3”, “2”, “1”]]’) >>> Cluster(0, 0, 0, Status.empty(), 0, 0, 0, history, None, \{}).timeline 4
+
_property _use_slots_:  https://docs.python.org/3/library/functions.html#bool[bool]_link:#patroni.dcs.Cluster.use_slots[];;
  `+True+` if cluster is configured to use replication slots.

We are using an old-style attribute declaration here because otherwise it is not possible to override `+\\__new\\__+` method in the link:#patroni.dcs.RemoteMember[`+RemoteMember+`] class.
+
Note

These two keys in data are always written to the DCS, but care is taken to maintain consistency and resilience from data that is read:

`+conn_url+`: connection string containing host, user and password which could be used to access this member. `+api_url+`: REST API url of patroni instance
+
Consists of the following fields:
+
Variables:;;
+
_abc_impl_ = <_abc._abc_data object>_link:#patroni.dcs.Member._abc_impl[];;
+
_property _api_url_:  https://docs.python.org/3/library/stdtypes.html#str[str] |  https://docs.python.org/3/library/constants.html#None[None]_link:#patroni.dcs.Member.api_url[];;
  The `+api_url+` value from `+data+` if defined.
+
_property _clonefrom_:  https://docs.python.org/3/library/functions.html#bool[bool]_link:#patroni.dcs.Member.clonefrom[];;
  `+True+` if both `+clonefrom+` tag is `+True+` and a connection URL is defined.
+
conn_kwargs(_auth:  https://docs.python.org/3/library/typing.html#typing.Any[Any] |  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]] |  https://docs.python.org/3/library/constants.html#None[None] = None_) →  https://docs.python.org/3/library/typing.html#typing.Dict[Dict][ https://docs.python.org/3/library/stdtypes.html#str[str],  https://docs.python.org/3/library/typing.html#typing.Any[Any]] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L271-L310[View on GitHub]link:#patroni.dcs.Member.conn_kwargs[];;
  Give keyword arguments used for PostgreSQL connection settings.
  +
  Parameters:::
    *auth* – Authentication properties - can be defined as anything supported by the `+psycopg2+` or `+psycopg+` modules. Converts a key of `+username+` to `+user+` if supplied.
  Returns:::
    A dictionary containing a merge of default parameter keys `+host+`, `+port+` and `+dbname+`, with the contents of `+data+` `+conn_kwargs+` key. If those are not defined will parse and reform connection parameters from link:#patroni.dcs.Member.conn_url[`+conn_url+`]. One of these two attributes needs to have data defined to construct the output dictionary. Finally, _auth_ parameters are merged with the dictionary before returned.
+
_property _conn_url_:  https://docs.python.org/3/library/stdtypes.html#str[str] |  https://docs.python.org/3/library/constants.html#None[None]_link:#patroni.dcs.Member.conn_url[];;
  The `+conn_url+` value from `+data+` if defined or constructed from `+conn_kwargs+`.
+
_static _from_node(_version:  https://docs.python.org/3/library/functions.html#int[int] |  https://docs.python.org/3/library/stdtypes.html#str[str]_, _name:  https://docs.python.org/3/library/stdtypes.html#str[str]_, _session:  https://docs.python.org/3/library/functions.html#int[int] |  https://docs.python.org/3/library/functions.html#float[float] |  https://docs.python.org/3/library/stdtypes.html#str[str] |  https://docs.python.org/3/library/constants.html#None[None]_, _value:  https://docs.python.org/3/library/stdtypes.html#str[str]_) → link:#patroni.dcs.Member[Member] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L224-L254[View on GitHub]link:#patroni.dcs.Member.from_node[];;
  Factory method for instantiating link:#patroni.dcs.Member[`+Member+`] from a JSON serialised string or object.
  +
  Parameters:::
  Returns:::
    an link:#patroni.dcs.Member[`+Member+`] instance built with the given arguments.
  Example:::

>>> Member.from_node(-1, '', '', '{"conn_url": "postgres://foo@bar/postgres"}') is not None
True

>>> Member.from_node(-1, '', '', '{')
Member(version=-1, name='', session='', data={})

>>> Member.from_node(1, '', '', '{"version":"1.2.3"}').patroni_version
(1, 2, 3)

The content held in _lines_ deserialized from _value_ are lines parsed from PostgreSQL timeline history files, consisting of the timeline number, the LSN where the timeline split and any other string held in the file. The files are parsed by `+parse_history()+`.
+
Variables:;;
+
_asdict() https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/y#L465-L467[View on GitHub]link:#patroni.dcs.TimelineHistory._asdict[];;
  Return a new dict which maps field names to their values.
+
_field_defaults_ = \{}_link:#patroni.dcs.TimelineHistory._field_defaults[];;
+
_fields_ = ('version', 'value', 'lines')_link:#patroni.dcs.TimelineHistory._fields[];;
+
_classmethod \\__make(_iterable_) https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/y#L442-L447[View on GitHub]link:#patroni.dcs.TimelineHistory._make[];;
  Make a new TimelineHistory object from a sequence or iterable
+
_replace(_**kwds_) https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/y#L452-L456[View on GitHub]link:#patroni.dcs.TimelineHistory._replace[];;
  Return a new TimelineHistory object replacing specified fields with new values
+
_static _from_node(_version:  https://docs.python.org/3/library/functions.html#int[int] |  https://docs.python.org/3/library/stdtypes.html#str[str]_, _value:  https://docs.python.org/3/library/stdtypes.html#str[str]_) → link:#patroni.dcs.TimelineHistory[TimelineHistory] https://github.com/zalando/patroni/blob/3d527f5728fa8c6fadc55284cf854eead6a30a9b/patroni/dcs/\\__init\\__.py#L761-L785[View on GitHub]link:#patroni.dcs.TimelineHistory.from_node[];;
  Parse the given JSON serialized string as a list of timeline history lines.
  +
  Parameters:::
  Returns:::
    composed timeline history object using parsed lines.
  Example:::
    If the passed _value_ argument is not parsed an empty list of lines is returned:
    +

>>> h = TimelineHistory.from_node(1, 2)

>>> h.lines
[]

If being packaged with PyInstaller, modules aren’t discoverable dynamically by scanning source directory because  https://docs.python.org/3/library/importlib.html#importlib.machinery.FrozenImporter[`+importlib.machinery.FrozenImporter+`] doesn’t implement `+iter_modules()+`. But it is still possible to find all potential DCS modules by iterating through `+toc+`, which contains list of all “frozen” resources.
+
Returns:;;
  list of known module names with absolute python module path namespace, e.g. `+patroni.dcs.etcd+`.

Using the list of available DCS classes returned by link:#patroni.dcs.iter_dcs_classes[`+iter_dcs_classes()+`] attempt to dynamically instantiate the class that implements a DCS using the abstract class link:#patroni.dcs.AbstractDCS[`+AbstractDCS+`].

Basic top-level configuration parameters retrieved from _config_ are propagated to the DCS specific config before being passed to the module DCS class.

If no module is found to satisfy configuration then report and log an error. This will cause Patroni to exit.
+
:raises `+PatroniFatalException+`: if a load of all available DCS modules have been tried and none succeeded.
+
Parameters:;;
  *config* – object or dictionary with Patroni configuration. This is normally a representation of the main Patroni
Returns:;;
  The first successfully loaded DCS module which is an implementation of link:#patroni.dcs.AbstractDCS[`+AbstractDCS+`].

If a module successfully imports we can assume that all its requirements are installed.
+
Parameters:;;
  *config* – configuration information with possible DCS names as keys. If given, only attempt to import DCS modules defined in the configuration. Else, if `+None+`, attempt to import any supported DCS module.
Yields:;;
  a tuple containing the module `+name+` and the imported DCS class object.

Original Governor stores connection strings for each cluster members in a following format:

\\__\\__
postgres://\{username}:\{password}@\{connect_address}/postgres
\\__\\__

Since each of our patroni instances provides their own REST API endpoint, it’s good to store this information in DCS along with PostgreSQL connection string. In order to not introduce new keys and be compatible with original Governor we decided to extend original connection string in a following way:

\\__\\__
postgres://\{username}:\{password}@\{connect_address}/postgres?application_name=\{api_url}
\\__\\__

This way original Governor could use such connection string as it is, because of feature of `+libpq+` library.
+
Parameters:;;
  *value* – The URL string to split.
Returns:;;
  the connection string stored in DCS split into two parts, `+conn_url+` and `+api_url+`.

PostgreSQL’s replication slot names must be valid PostgreSQL names. This function maps the wider space of member names to valid PostgreSQL names. Names have their case lowered, dashes and periods common in hostnames are replaced with underscores, other characters are encoded as their unicode codepoint. Name is truncated to 64 characters. Multiple different member names may map to a single slot name.
+
Parameters:;;
  *member_name* – The string to convert to a slot name.
Returns:;;
  The string converted using the rules described above.