netdata/python.d/postgres.chart.py at master · Zypan/netdata · GitHub

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# -*- coding: utf-8 -*-

# Description: example netdata python.d module

# Authors: facetoe, dangtranhoang

from copy import deepcopy

try:

import psycopg2

from psycopg2 import extensions

from psycopg2.extras import DictCursor

from psycopg2 import OperationalError

PSYCOPG2 = True

except ImportError:

PSYCOPG2 = False

from bases.FrameworkServices.SimpleService import SimpleService

# default module values

update_every = 1

priority = 60000

retries = 60

METRICS = dict(

DATABASE=['connections',

'xact_commit',

'xact_rollback',

'blks_read',

'blks_hit',

'tup_returned',

'tup_fetched',

'tup_inserted',

'tup_updated',

'tup_deleted',

'conflicts',

'temp_files',

'temp_bytes',

'size'],

BACKENDS=['backends_active',

'backends_idle'],

INDEX_STATS=['index_count',

'index_size'],

TABLE_STATS=['table_size',

'table_count'],

WAL=['written_wal',

'recycled_wal',

'total_wal'],

WAL_WRITES=['wal_writes'],

ARCHIVE=['ready_count',

'done_count',

'file_count'],

BGWRITER=['checkpoint_scheduled',

'checkpoint_requested',

'buffers_checkpoint',

'buffers_clean',

'maxwritten_clean',

'buffers_backend',

'buffers_alloc',

'buffers_backend_fsync'],

LOCKS=['ExclusiveLock',

'RowShareLock',

'SIReadLock',

'ShareUpdateExclusiveLock',

'AccessExclusiveLock',

'AccessShareLock',

'ShareRowExclusiveLock',

'ShareLock',

'RowExclusiveLock'],

AUTOVACUUM=['analyze',

'vacuum_analyze',

'vacuum',

'vacuum_freeze',

'brin_summarize'],

STANDBY_DELTA=['sent_delta',

'write_delta',

'flush_delta',

'replay_delta'

REPSLOT_FILES=['replslot_wal_keep',

'replslot_files']

)

QUERIES = dict(

WAL="""

SELECT

count(*) as total_wal,

count(*) FILTER (WHERE type = 'recycled') AS recycled_wal,

count(*) FILTER (WHERE type = 'written') AS written_wal

FROM

(SELECT wal.name,

pg_{0}file_name(CASE pg_is_in_recovery() WHEN true THEN NULL ELSE pg_current_{0}_{1}() END ),

CASE WHEN wal.name > pg_{0}file_name(CASE pg_is_in_recovery() WHEN true THEN NULL ELSE pg_current_{0}_{1}() END ) THEN 'recycled'

ELSE 'written'

END AS type

FROM pg_catalog.pg_ls_dir('pg_{0}') AS wal(name)

WHERE name ~ '^[0-9A-F]{{24}}$'

ORDER BY (pg_stat_file('pg_{0}/'||name)).modification, wal.name DESC) sub;

""",

ARCHIVE="""

SELECT

CAST(COUNT(*) AS INT) AS file_count,

CAST(COALESCE(SUM(CAST(archive_file ~ $r$\.ready$$r$ as INT)), 0) AS INT) AS ready_count,

CAST(COALESCE(SUM(CAST(archive_file ~ $r$\.done$$r$ AS INT)), 0) AS INT) AS done_count

FROM

pg_catalog.pg_ls_dir('pg_{0}/archive_status') AS archive_files (archive_file);

""",

BACKENDS="""

SELECT

count(*) - (SELECT count(*) FROM pg_stat_activity WHERE state = 'idle') AS backends_active,

(SELECT count(*) FROM pg_stat_activity WHERE state = 'idle' ) AS backends_idle

FROM pg_stat_activity;

""",

TABLE_STATS="""

SELECT

((sum(relpages) * 8) * 1024) AS table_size,

count(1) AS table_count

FROM pg_class

WHERE relkind IN ('r', 't');

""",

INDEX_STATS="""

SELECT

((sum(relpages) * 8) * 1024) AS index_size,

count(1) AS index_count

FROM pg_class

WHERE relkind = 'i';""",

DATABASE="""

SELECT

datname AS database_name,

numbackends AS connections,

xact_commit AS xact_commit,

xact_rollback AS xact_rollback,

blks_read AS blks_read,

blks_hit AS blks_hit,

tup_returned AS tup_returned,

tup_fetched AS tup_fetched,

tup_inserted AS tup_inserted,

tup_updated AS tup_updated,

tup_deleted AS tup_deleted,

conflicts AS conflicts,

pg_database_size(datname) AS size,

temp_files AS temp_files,

temp_bytes AS temp_bytes

FROM pg_stat_database

WHERE datname IN %(databases)s

;

""",

BGWRITER="""

SELECT

checkpoints_timed AS checkpoint_scheduled,

checkpoints_req AS checkpoint_requested,

buffers_checkpoint * current_setting('block_size')::numeric buffers_checkpoint,

buffers_clean * current_setting('block_size')::numeric buffers_clean,

maxwritten_clean,

buffers_backend * current_setting('block_size')::numeric buffers_backend,

buffers_alloc * current_setting('block_size')::numeric buffers_alloc,

buffers_backend_fsync

FROM pg_stat_bgwriter;

""",

LOCKS="""

SELECT

pg_database.datname as database_name,

mode,

count(mode) AS locks_count

FROM pg_locks

INNER JOIN pg_database ON pg_database.oid = pg_locks.database

GROUP BY datname, mode

ORDER BY datname, mode;

""",

FIND_DATABASES="""

SELECT datname

FROM pg_stat_database

WHERE has_database_privilege((SELECT current_user), datname, 'connect')

AND NOT datname ~* '^template\d+';

""",

FIND_STANDBY="""

SELECT application_name

FROM pg_stat_replication

WHERE application_name IS NOT NULL

GROUP BY application_name;

""",

FIND_REPLICATION_SLOT="""

SELECT slot_name

FROM pg_replication_slots;

""",

STANDBY_DELTA="""

SELECT application_name,

pg_{0}_{1}_diff(CASE pg_is_in_recovery() WHEN true THEN pg_last_{0}_receive_{1}() ELSE pg_current_{0}_{1}() END , sent_{1}) AS sent_delta,

pg_{0}_{1}_diff(CASE pg_is_in_recovery() WHEN true THEN pg_last_{0}_receive_{1}() ELSE pg_current_{0}_{1}() END , write_{1}) AS write_delta,

pg_{0}_{1}_diff(CASE pg_is_in_recovery() WHEN true THEN pg_last_{0}_receive_{1}() ELSE pg_current_{0}_{1}() END , flush_{1}) AS flush_delta,

pg_{0}_{1}_diff(CASE pg_is_in_recovery() WHEN true THEN pg_last_{0}_receive_{1}() ELSE pg_current_{0}_{1}() END , replay_{1}) AS replay_delta

FROM pg_stat_replication

WHERE application_name IS NOT NULL;

""",

REPSLOT_FILES="""

WITH wal_size AS (

SELECT current_setting('wal_block_size')::INT * setting::INT AS val

FROM pg_settings

WHERE name = 'wal_segment_size'

)

SELECT slot_name, slot_type, replslot_wal_keep, count(slot_file) AS replslot_files

FROM (

SELECT slot.slot_name, CASE WHEN slot_file <> 'state' THEN 1 END AS slot_file , slot_type,

COALESCE (floor((pg_wal_lsn_diff (pg_current_wal_lsn (),

slot.restart_lsn) - (pg_walfile_name_offset (restart_lsn)).file_offset) / (s.val)),

0) AS replslot_wal_keep

FROM pg_replication_slots slot

LEFT JOIN (

SELECT slot2.slot_name,

pg_ls_dir('pg_replslot/' || slot2.slot_name) AS slot_file

FROM pg_replication_slots slot2

) files (slot_name, slot_file)

ON slot.slot_name = files.slot_name

CROSS JOIN wal_size s) AS d

GROUP BY slot_name, slot_type, replslot_wal_keep;

""",

IF_SUPERUSER="""

SELECT current_setting('is_superuser') = 'on' AS is_superuser;

""",

DETECT_SERVER_VERSION="""

SHOW server_version_num;

""",

AUTOVACUUM="""

SELECT

count(*) FILTER (WHERE query LIKE 'autovacuum: ANALYZE%%') AS analyze,

count(*) FILTER (WHERE query LIKE 'autovacuum: VACUUM ANALYZE%%') AS vacuum_analyze,

count(*) FILTER (WHERE query LIKE 'autovacuum: VACUUM%%'

AND query NOT LIKE 'autovacuum: VACUUM ANALYZE%%'

AND query NOT LIKE '%%to prevent wraparound%%') AS vacuum,

count(*) FILTER (WHERE query LIKE '%%to prevent wraparound%%') AS vacuum_freeze,

count(*) FILTER (WHERE query LIKE 'autovacuum: BRIN summarize%%') AS brin_summarize

FROM pg_stat_activity

WHERE query NOT LIKE '%%pg_stat_activity%%';

""",

DIFF_LSN="""

SELECT pg_{0}_{1}_diff(CASE pg_is_in_recovery() WHEN true THEN pg_last_{0}_receive_{1}() ELSE pg_current_{0}_{1}() END, '0/0') as wal_writes ;

"""

)

QUERY_STATS = {

QUERIES['DATABASE']: METRICS['DATABASE'],

QUERIES['BACKENDS']: METRICS['BACKENDS'],

QUERIES['LOCKS']: METRICS['LOCKS']

}

ORDER = ['db_stat_temp_files', 'db_stat_temp_bytes', 'db_stat_blks', 'db_stat_tuple_returned', 'db_stat_tuple_write',

'db_stat_transactions', 'db_stat_connections', 'database_size', 'backend_process', 'index_count', 'index_size',

'table_count', 'table_size', 'wal', 'wal_writes', 'archive_wal', 'checkpointer', 'stat_bgwriter_alloc', 'stat_bgwriter_checkpoint',

'stat_bgwriter_backend', 'stat_bgwriter_backend_fsync', 'stat_bgwriter_bgwriter', 'stat_bgwriter_maxwritten',

'replication_slot', 'standby_delta', 'autovacuum']

CHARTS = {

'db_stat_transactions': {

'options': [None, 'Transactions on db', 'transactions/s', 'db statistics', 'postgres.db_stat_transactions',

'line'],

'lines': [

['xact_commit', 'committed', 'incremental'],

['xact_rollback', 'rolled back', 'incremental']

]},

'db_stat_connections': {

'options': [None, 'Current connections to db', 'count', 'db statistics', 'postgres.db_stat_connections',

'line'],

'lines': [

['connections', 'connections', 'absolute']

]},

'db_stat_blks': {

'options': [None, 'Disk blocks reads from db', 'reads/s', 'db statistics', 'postgres.db_stat_blks', 'line'],

'lines': [

['blks_read', 'disk', 'incremental'],

['blks_hit', 'cache', 'incremental']

]},

'db_stat_tuple_returned': {

'options': [None, 'Tuples returned from db', 'tuples/s', 'db statistics', 'postgres.db_stat_tuple_returned',

'line'],

'lines': [

['tup_returned', 'sequential', 'incremental'],

['tup_fetched', 'bitmap', 'incremental']

]},

'db_stat_tuple_write': {

'options': [None, 'Tuples written to db', 'writes/s', 'db statistics', 'postgres.db_stat_tuple_write', 'line'],

'lines': [

['tup_inserted', 'inserted', 'incremental'],

['tup_updated', 'updated', 'incremental'],

['tup_deleted', 'deleted', 'incremental'],

['conflicts', 'conflicts', 'incremental']

]},

'db_stat_temp_bytes': {

'options': [None, 'Temp files written to disk', 'KB/s', 'db statistics', 'postgres.db_stat_temp_bytes', 'line'],

'lines': [

['temp_bytes', 'size', 'incremental', 1, 1024]

]},

'db_stat_temp_files': {

'options': [None, 'Temp files written to disk', 'files', 'db statistics', 'postgres.db_stat_temp_files', 'line'],

'lines': [

['temp_files', 'files', 'incremental']

]},

'database_size': {

'options': [None, 'Database size', 'MB', 'database size', 'postgres.db_size', 'stacked'],

'lines': [

]},

'backend_process': {

'options': [None, 'Current Backend Processes', 'processes', 'backend processes', 'postgres.backend_process',

'line'],

'lines': [

['backends_active', 'active', 'absolute'],

['backends_idle', 'idle', 'absolute']

]},

'index_count': {

'options': [None, 'Total indexes', 'index', 'indexes', 'postgres.index_count', 'line'],

'lines': [

['index_count', 'total', 'absolute']

]},

'index_size': {

'options': [None, 'Indexes size', 'MB', 'indexes', 'postgres.index_size', 'line'],

'lines': [

['index_size', 'size', 'absolute', 1, 1024 * 1024]

]},

'table_count': {

'options': [None, 'Total Tables', 'tables', 'tables', 'postgres.table_count', 'line'],

'lines': [

['table_count', 'total', 'absolute']

]},

'table_size': {

'options': [None, 'Tables size', 'MB', 'tables', 'postgres.table_size', 'line'],

'lines': [

['table_size', 'size', 'absolute', 1, 1024 * 1024]

]},

'wal': {

'options': [None, 'Write-Ahead Logs', 'files', 'wal', 'postgres.wal', 'line'],

'lines': [

['written_wal', 'written', 'absolute'],

['recycled_wal', 'recycled', 'absolute'],

['total_wal', 'total', 'absolute']

]},

'wal_writes': {

'options': [None, 'Write-Ahead Logs', 'kilobytes/s', 'wal_writes', 'postgres.wal_writes', 'line'],

'lines': [

['wal_writes', 'writes', 'incremental', 1, 1024]

]},

'archive_wal': {

'options': [None, 'Archive Write-Ahead Logs', 'files/s', 'archive wal', 'postgres.archive_wal', 'line'],

'lines': [

['file_count', 'total', 'incremental'],

['ready_count', 'ready', 'incremental'],

['done_count', 'done', 'incremental']

]},

'checkpointer': {

'options': [None, 'Checkpoints', 'writes', 'checkpointer', 'postgres.checkpointer', 'line'],

'lines': [

['checkpoint_scheduled', 'scheduled', 'incremental'],

['checkpoint_requested', 'requested', 'incremental']

]},

'stat_bgwriter_alloc': {

'options': [None, 'Buffers allocated', 'kilobytes/s', 'bgwriter', 'postgres.stat_bgwriter_alloc', 'line'],

'lines': [

['buffers_alloc', 'alloc', 'incremental', 1, 1024]

]},

'stat_bgwriter_checkpoint': {

'options': [None, 'Buffers written during checkpoints', 'kilobytes/s', 'bgwriter', 'postgres.stat_bgwriter_checkpoint', 'line'],

'lines': [

['buffers_checkpoint', 'checkpoint', 'incremental', 1, 1024]

]},

'stat_bgwriter_backend': {

'options': [None, 'Buffers written directly by a backend', 'kilobytes/s', 'bgwriter', 'postgres.stat_bgwriter_backend', 'line'],

'lines': [

['buffers_backend', 'backend', 'incremental', 1, 1024]

]},

'stat_bgwriter_backend_fsync': {

'options': [None, 'Fsync by backend', 'times', 'bgwriter', 'postgres.stat_bgwriter_backend_fsync', 'line'],

'lines': [

['buffers_backend_fsync', 'backend fsync', 'incremental']

]},

'stat_bgwriter_bgwriter': {

'options': [None, 'Buffers written by the background writer', 'kilobytes/s', 'bgwriter', 'postgres.bgwriter_bgwriter', 'line'],

'lines': [

['buffers_clean', 'clean', 'incremental', 1, 1024]

]},

'stat_bgwriter_maxwritten': {

'options': [None, 'Too many buffers written', 'times', 'bgwriter', 'postgres.stat_bgwriter_maxwritten', 'line'],

'lines': [

['maxwritten_clean', 'maxwritten', 'incremental']

]},

'autovacuum': {

'options': [None, 'Autovacuum workers', 'workers', 'autovacuum', 'postgres.autovacuum', 'line'],

'lines': [

['analyze', 'analyze', 'absolute'],

['vacuum', 'vacuum', 'absolute'],

['vacuum_analyze', 'vacuum analyze', 'absolute'],

['vacuum_freeze', 'vacuum freeze', 'absolute'],

['brin_summarize', 'brin summarize', 'absolute']

]},

'standby_delta': {

'options': [None, 'Standby delta', 'kilobytes', 'replication delta', 'postgres.standby_delta', 'line'],

'lines': [

['sent_delta', 'sent delta', 'absolute', 1, 1024],

['write_delta', 'write delta', 'absolute', 1, 1024],

['flush_delta', 'flush delta', 'absolute', 1, 1024],

['replay_delta', 'replay delta', 'absolute', 1, 1024]

]},

'replication_slot': {

'options': [None, 'Replication slot files', 'files', 'replication slot', 'postgres.replication_slot', 'line'],

'lines': [

['replslot_wal_keep', 'wal keeped', 'absolute'],

['replslot_files', 'pg_replslot files', 'absolute']

]}

}

class Service(SimpleService):

def __init__(self, configuration=None, name=None):

SimpleService.__init__(self, configuration=configuration, name=name)

self.order = ORDER[:]

self.definitions = deepcopy(CHARTS)

self.table_stats = configuration.pop('table_stats', False)

self.index_stats = configuration.pop('index_stats', False)

self.database_poll = configuration.pop('database_poll', None)

self.configuration = configuration

self.connection = False

self.server_version = None

self.data = dict()

self.locks_zeroed = dict()

self.databases = list()

self.secondaries = list()

self.replication_slots = list()

self.queries = QUERY_STATS.copy()

def _connect(self):

params = dict(user='postgres',

database=None,

password=None,

host=None,

port=5432)

params.update(self.configuration)

if not self.connection:

try:

self.connection = psycopg2.connect(**params)

self.connection.set_isolation_level(extensions.ISOLATION_LEVEL_AUTOCOMMIT)

self.connection.set_session(readonly=True)

except OperationalError as error:

return False, str(error)

return True, True

def check(self):

if not PSYCOPG2:

self.error('\'python-psycopg2\' module is needed to use postgres.chart.py')

return False

result, error = self._connect()

if not result:

conf = dict((k, (lambda k, v: v if k != 'password' else '*****')(k, v))

for k, v in self.configuration.items())

self.error('Failed to connect to %s. Error: %s' % (str(conf), error))

return False

try:

cursor = self.connection.cursor()

self.databases = discover_databases_(cursor, QUERIES['FIND_DATABASES'])

is_superuser = check_if_superuser_(cursor, QUERIES['IF_SUPERUSER'])

self.secondaries = discover_secondaries_(cursor, QUERIES['FIND_STANDBY'])

self.server_version = detect_server_version(cursor, QUERIES['DETECT_SERVER_VERSION'])

if self.server_version >= 94000:

self.replication_slots = discover_replication_slots_(cursor, QUERIES['FIND_REPLICATION_SLOT'])

cursor.close()

if self.database_poll and isinstance(self.database_poll, str):

self.databases = [dbase for dbase in self.databases if dbase in self.database_poll.split()]\

or self.databases

self.locks_zeroed = populate_lock_types(self.databases)

self.add_additional_queries_(is_superuser)

self.create_dynamic_charts_()

return True

except Exception as error:

self.error(str(error))

return False

def add_additional_queries_(self, is_superuser):

if self.server_version >= 100000:

wal = 'wal'

lsn = 'lsn'

else:

wal = 'xlog'

lsn = 'location'

self.queries[QUERIES['BGWRITER']] = METRICS['BGWRITER']

self.queries[QUERIES['DIFF_LSN'].format(wal, lsn)] = METRICS['WAL_WRITES']

self.queries[QUERIES['STANDBY_DELTA'].format(wal, lsn)] = METRICS['STANDBY_DELTA']

if self.index_stats:

self.queries[QUERIES['INDEX_STATS']] = METRICS['INDEX_STATS']

if self.table_stats:

self.queries[QUERIES['TABLE_STATS']] = METRICS['TABLE_STATS']

if is_superuser:

self.queries[QUERIES['ARCHIVE'].format(wal)] = METRICS['ARCHIVE']

if self.server_version >= 90400:

self.queries[QUERIES['WAL'].format(wal, lsn)] = METRICS['WAL']

if self.server_version >= 100000:

self.queries[QUERIES['REPSLOT_FILES']] = METRICS['REPSLOT_FILES']

if self.server_version >= 90400:

self.queries[QUERIES['AUTOVACUUM']] = METRICS['AUTOVACUUM']

def create_dynamic_charts_(self):

for database_name in self.databases[::-1]:

self.definitions['database_size']['lines'].append(

[database_name + '_size', database_name, 'absolute', 1, 1024 * 1024])

for chart_name in [name for name in self.order if name.startswith('db_stat')]:

add_database_stat_chart_(order=self.order, definitions=self.definitions,

name=chart_name, database_name=database_name)

add_database_lock_chart_(order=self.order, definitions=self.definitions, database_name=database_name)

for application_name in self.secondaries[::-1]:

add_replication_delta_chart_(

order=self.order,

definitions=self.definitions,

name='standby_delta',

application_name=application_name)

for slot_name in self.replication_slots[::-1]:

add_replication_slot_chart_(

order=self.order,

definitions=self.definitions,

name='replication_slot',

slot_name=slot_name)

def _get_data(self):

result, error = self._connect()

if result:

cursor = self.connection.cursor(cursor_factory=DictCursor)

try:

self.data.update(self.locks_zeroed)

for query, metrics in self.queries.items():

self.query_stats_(cursor, query, metrics)

except OperationalError:

self.connection = False

cursor.close()

return None

else:

cursor.close()

return self.data

else:

return None

def query_stats_(self, cursor, query, metrics):

cursor.execute(query, dict(databases=tuple(self.databases)))

for row in cursor:

for metric in metrics:

if 'database_name' in row:

dimension_id = '_'.join([row['database_name'], metric])

elif 'application_name' in row:

dimension_id = '_'.join([row['application_name'], metric])

elif 'slot_name' in row:

dimension_id = '_'.join([row['slot_name'], metric])

else:

dimension_id = metric

if metric in row:

if row[metric] is not None:

self.data[dimension_id] = int(row[metric])

elif 'locks_count' in row:

self.data[dimension_id] = row['locks_count'] if metric == row['mode'] else 0

def discover_databases_(cursor, query):

cursor.execute(query)

result = list()

for db in [database[0] for database in cursor]:

if db not in result:

result.append(db)

return result

def discover_secondaries_(cursor, query):

cursor.execute(query)

result = list()

for sc in [standby[0] for standby in cursor]:

if sc not in result:

result.append(sc)

return result

def discover_replication_slots_(cursor, query):

cursor.execute(query)

result = list()

for slot in [replication_slot[0] for replication_slot in cursor]:

if slot not in result:

result.append(slot)

return result

def check_if_superuser_(cursor, query):

cursor.execute(query)

return cursor.fetchone()[0]

def detect_server_version(cursor, query):

cursor.execute(query)

return int(cursor.fetchone()[0])

def populate_lock_types(databases):

result = dict()

for database in databases:

for lock_type in METRICS['LOCKS']:

key = '_'.join([database, lock_type])

result[key] = 0

return result

def add_database_lock_chart_(order, definitions, database_name):

def create_lines(database):

result = list()

for lock_type in METRICS['LOCKS']:

dimension_id = '_'.join([database, lock_type])

result.append([dimension_id, lock_type, 'absolute'])

return result

chart_name = database_name + '_locks'

order.insert(-1, chart_name)

definitions[chart_name] = {

'options':

[None, 'Locks on db: ' + database_name, 'locks', 'db ' + database_name, 'postgres.db_locks', 'line'],

'lines': create_lines(database_name)

}

def add_database_stat_chart_(order, definitions, name, database_name):

def create_lines(database, lines):

result = list()

for line in lines:

new_line = ['_'.join([database, line[0]])] + line[1:]

result.append(new_line)

return result

chart_template = CHARTS[name]

chart_name = '_'.join([database_name, name])

order.insert(0, chart_name)

name, title, units, family, context, chart_type = chart_template['options']

definitions[chart_name] = {

'options': [name, title + ': ' + database_name, units, 'db ' + database_name, context, chart_type],

'lines': create_lines(database_name, chart_template['lines'])}

def add_replication_delta_chart_(order, definitions, name, application_name):

def create_lines(standby, lines):

result = list()

for line in lines:

new_line = ['_'.join([standby, line[0]])] + line[1:]

result.append(new_line)

return result

chart_template = CHARTS[name]

chart_name = '_'.join([application_name, name])

position = order.index('database_size')

order.insert(position, chart_name)

name, title, units, family, context, chart_type = chart_template['options']

definitions[chart_name] = {

'options': [name, title + ': ' + application_name, units, 'replication delta', context, chart_type],

'lines': create_lines(application_name, chart_template['lines'])}

def add_replication_slot_chart_(order, definitions, name, slot_name):

def create_lines(slot, lines):

result = list()

for line in lines:

new_line = ['_'.join([slot, line[0]])] + line[1:]

result.append(new_line)

return result

chart_template = CHARTS[name]

chart_name = '_'.join([slot_name, name])

position = order.index('database_size')

order.insert(position, chart_name)

name, title, units, family, context, chart_type = chart_template['options']

definitions[chart_name] = {

'options': [name, title + ': ' + slot_name, units, 'replication slot files', context, chart_type],

'lines': create_lines(slot_name, chart_template['lines'])}

netdata/python.d/postgres.chart.py at master · Zypan/netdata · GitHub

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