Add metrics for tracking cache hit ratios
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@ -19,10 +19,12 @@ metrics:
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type: value
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query:
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0: SHOW server_version_num
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max_frozen_age:
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type: row
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query:
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0: SELECT max(age(datfrozenxid)) AS xid_age, max(mxid_age(datminmxid)) AS mxid_age FROM pg_database
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0: SELECT max(age(datfrozenxid)) AS xid_age, 0 AS mxid_age FROM pg_database
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90600: SELECT max(age(datfrozenxid)) AS xid_age, max(mxid_age(datminmxid)) AS mxid_age FROM pg_database
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# Per-database metrics
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db_stats:
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@ -33,6 +35,11 @@ metrics:
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test_args:
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dbname: postgres
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hit_ratios:
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type: row
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query:
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0: SELECT sum(heap_blks_read)::float / sum(heap_blks_read + heap_blks_hit) AS avg_heap_hit_ratio, sum(idx_blks_hit)::float / sum(idx_blks_read + idx_blks_hit) AS avg_idx_hit_ratio, sum(toast_blks_hit)::float / sum(toast_blks_read + toast_blks_hit) AS avg_toast_hit_ratio, sum(tidx_blks_hit)::float / sum(tidx_blks_read + tidx_blks_hit) AS avg_tidx_hit_ratio FROM pg_statio_all_tables
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# Debugging
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ntables:
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type: value
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@ -656,7 +656,11 @@ def test_queries():
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# If the metric has arguments to use while testing, grab those
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args = metric.get("test_args", {})
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# Run the query without the ability to retry.
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res = sample_metric(dbname, name, args, retry=False)
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try:
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res = sample_metric(dbname, name, args, retry=False)
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except MetricVersionError:
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print("{} -> Unsupported for this version".format(name))
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continue
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# Compare the result to the provided sample results
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# TODO
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print("{} -> {}".format(name, res))
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@ -714,6 +718,7 @@ class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
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except LatestVersionCheckError as e:
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log.error("Failed to retrieve latest version information: {}".format(e))
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self._reply(503, "Failed to retrieve latest version info")
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return
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# Note: parse_qs returns the values as a list. Since we always expect
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# single values, just grab the first from each.
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@ -673,6 +673,98 @@ zabbix_export:
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value: '{#DBNAME}'
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- tag: Type
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value: Calculated
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- uuid: bb0690e123e94e35a9bbd0f05ee322b4
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name: 'Database Hit Ratios for {#DBNAME}'
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type: HTTP_AGENT
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key: 'pgmon_db_hit_ratios[{#DBNAME}]'
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history: '0'
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value_type: TEXT
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trends: '0'
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url: 'http://localhost:{$AGENT_PORT}/hit_ratios'
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query_fields:
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- name: dbname
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value: '{#DBNAME}'
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tags:
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- tag: Application
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value: PostgreSQL
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- tag: Database
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value: '{#DBNAME}'
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- uuid: e0edbaf6f98249a6b357ade2ab41a76a
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name: 'Average heap hit ratio on {#DBNAME}'
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type: DEPENDENT
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key: 'pgmon_db_hit_ratio[heap,{#DBNAME}]'
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delay: '0'
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history: 90d
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value_type: FLOAT
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description: 'The cache (shared_buffers) hit ratio for heap entries for the given database'
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preprocessing:
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- type: JSONPATH
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parameters:
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- $.avg_heap_hit_ratio
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master_item:
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key: 'pgmon_db_hit_ratios[{#DBNAME}]'
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tags:
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- tag: Application
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value: PostgreSQL
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- tag: Database
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value: '{#DBNAME}'
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- uuid: e4956d433a47455ca0c00d67a0f59355
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name: 'Average index hit ratio on {#DBNAME}'
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type: DEPENDENT
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key: 'pgmon_db_hit_ratio[index,{#DBNAME}]'
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delay: '0'
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history: 90d
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value_type: FLOAT
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description: 'The cache (shared_buffers) hit ratio for index entries for the given database'
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preprocessing:
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- type: JSONPATH
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parameters:
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- $.avg_idx_hit_ratio
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master_item:
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key: 'pgmon_db_hit_ratios[{#DBNAME}]'
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tags:
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- tag: Application
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value: PostgreSQL
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- tag: Database
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value: '{#DBNAME}'
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- uuid: 0335267c14a8410a80a16b38167efcb3
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name: 'Average toast hit ratio on {#DBNAME}'
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type: DEPENDENT
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key: 'pgmon_db_hit_ratio[toast,{#DBNAME}]'
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delay: '0'
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history: 90d
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value_type: FLOAT
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description: 'The cache (shared_buffers) hit ratio for heap entries for the given database'
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preprocessing:
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- type: JSONPATH
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parameters:
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- $.avg_toast_hit_ratio
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master_item:
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key: 'pgmon_db_hit_ratios[{#DBNAME}]'
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tags:
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- tag: Application
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value: PostgreSQL
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- tag: Database
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value: '{#DBNAME}'
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- uuid: 3f7da45e351443528c6c36145d38f9b8
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name: 'Average toast index hit ratio on {#DBNAME}'
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type: DEPENDENT
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key: 'pgmon_db_hit_ratio[toast_index,{#DBNAME}]'
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delay: '0'
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history: 90d
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value_type: FLOAT
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description: 'The cache (shared_buffers) hit ratio for toast index entries for the given database'
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preprocessing:
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- type: JSONPATH
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parameters:
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- $.avg_tidx_hit_ratio
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master_item:
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key: 'pgmon_db_hit_ratios[{#DBNAME}]'
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tags:
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- tag: Application
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value: PostgreSQL
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- tag: Database
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value: '{#DBNAME}'
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- uuid: 492b3cac15f348c2b85f97b69c114d1b
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name: 'Database Stats for {#DBNAME}'
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type: HTTP_AGENT
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