248 lines
10 KiB
Lua
248 lines
10 KiB
Lua
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---@meta
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---@class PrometheusLib
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local PrometheusLib = {}
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---@class PrometheusOptions
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---is a table of configuration options that can be provided.
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local PrometheusOptions = {}
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---metric name prefix.
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---This string will be prepended to metric names on output.
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PrometheusOptions.prefix = ''
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---Can be used to change the default name of error metric (see
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---[Built-in metrics](https://github.com/knyar/nginx-lua-prometheus#built-in-metrics)
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---for details).
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PrometheusOptions.error_metric_name = ''
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---sets per-worker counter sync interval in seconds.
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---This sets the boundary on eventual consistency of counter metrics.
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---Defaults to `1`.
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PrometheusOptions.sync_interval = 0
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---maximum size of a per-metric lookup table maintained by
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---each worker to cache full metric names. Defaults to `1000`.
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---If you have metrics with extremely high cardinality and lots
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---of available RAM, you might want to increase this to avoid
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---cache getting flushed too often.
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---Decreasing this makes sense if you have a very large number of metrics
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---or need to minimize memory usage of this library.
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PrometheusOptions.lookup_max_size = 0
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---Initializes the module.
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---This should be called once from the
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---[init_worker_by_lua_block](https://github.com/openresty/lua-nginx-module#init_worker_by_lua_block)
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---section of nginx configuration.
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---
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---Example:
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---```
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---init_worker_by_lua_block {
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--- prometheus = require("prometheus").init("prometheus_metrics", {sync_interval=3})
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---}
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---```
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---@param dict_name string is the name of the nginx shared dictionary which will be used to store all metrics. Defaults to `prometheus_metrics` if not specified.
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---@param options? PrometheusOptions is a table of configuration options that can be provided.
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---@return Prometheus prometheus Returns a `prometheus` object that should be used to register metrics.
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PrometheusLib.init = function(dict_name, options) end
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---@class Prometheus
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local Prometheus = {}
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---Registers a counter.
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---
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---Should be called once for each gauge from the
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---[init_worker_by_lua_block](https://github.com/openresty/lua-nginx-module#init_worker_by_lua_block)
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---section.
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---
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---Example:
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---```
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---init_worker_by_lua_block {
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--- prometheus = require("prometheus").init("prometheus_metrics")
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---
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--- metric_bytes = prometheus:counter(
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--- "nginx_http_request_size_bytes", "Total size of incoming requests")
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--- metric_requests = prometheus:counter(
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--- "nginx_http_requests_total", "Number of HTTP requests", {"host", "status"})
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---}
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---```
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---@param name string is the name of the metric.
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---@param description? string is the text description. Optional.
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---@param label_names? string[] is an array of label names for the metric. Optional.
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---@return PrometheusCounter
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function Prometheus:counter(name, description, label_names) end
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---Registers a gauge.
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---
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---Should be called once for each gauge from the
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---[init_worker_by_lua_block](https://github.com/openresty/lua-nginx-module#init_worker_by_lua_block)
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---section.
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---
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---Example:
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---```
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---init_worker_by_lua_block {
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--- prometheus = require("prometheus").init("prometheus_metrics")
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---
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--- metric_connections = prometheus:gauge(
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--- "nginx_http_connections", "Number of HTTP connections", {"state"})
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---}
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---```
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---@param name string is the name of the metric.
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---@param description? string is the text description. Optional.
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---@param label_names? string[] is an array of label names for the metric. Optional.
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---@return PrometheusGauge
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function Prometheus:gauge(name, description, label_names) end
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---Registers a histogram.
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---
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---Should be called once for each histogram from the
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---[init_worker_by_lua_block](https://github.com/openresty/lua-nginx-module#init_worker_by_lua_block)
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---section.
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---
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---Example:
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---```
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---init_worker_by_lua_block {
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--- prometheus = require("prometheus").init("prometheus_metrics")
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---
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--- metric_latency = prometheus:histogram(
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--- "nginx_http_request_duration_seconds", "HTTP request latency", {"host"})
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--- metric_response_sizes = prometheus:histogram(
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--- "nginx_http_response_size_bytes", "Size of HTTP responses", nil,
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--- {10,100,1000,10000,100000,1000000})
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---}
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---```
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---@param name string is the name of the metric.
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---@param description? string is the text description. Optional.
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---@param label_names? string[] is an array of label names for the metric. Optional.
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---@param buckets? number[] is an array of numbers defining bucket boundaries. Optional, defaults to 20 latency buckets covering a range from 5ms to 10s (in seconds).
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---@return PrometheusHist
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function Prometheus:histogram(name, description, label_names, buckets) end
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---Presents all metrics in a text format compatible with Prometheus.
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---This should be called in [content_by_lua_block](https://github.com/openresty/lua-nginx-module#content_by_lua_block)
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---to expose the metrics on a separate HTTP page.
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---
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---Example:
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---```
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---location /metrics {
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--- content_by_lua_block { prometheus:collect() }
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--- allow 192.168.0.0/16;
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--- deny all;
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---}
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---```
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function Prometheus:collect() end
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---Returns metric data as an array of strings.
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---@return string[]
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function Prometheus:metric_data() end
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---@class PrometheusCounter
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local PrometheusCounter = {}
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---Increments a previously registered counter.
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---This is usually called from log_by_lua_block globally or per server/location.
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---
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---The number of label values should match the number of label names
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---defined when the counter was registered using `prometheus:counter()`.
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---No label values should be provided for counters with no labels.
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---Non-printable characters will be stripped from label values.
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---
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---Example:
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---```
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---log_by_lua_block {
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--- metric_bytes:inc(tonumber(ngx.var.request_length))
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--- metric_requests:inc(1, {ngx.var.server_name, ngx.var.status})
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---}
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---```
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---@param value number is a value that should be added to the counter. Defaults to 1.
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---@param label_values? string[] is an array of label values.
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function PrometheusCounter:inc(value, label_values) end
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---Delete a previously registered counter.
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---This is usually called when you don't need to observe such counter
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---(or a metric with specific label values in this counter) any more.
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---If this counter has labels, you have to pass `label_values` to delete
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---the specific metric of this counter.
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---If you want to delete all the metrics of a counter with labels,
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---you should call `Counter:reset()`.
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---
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---This function will wait for sync_interval before deleting the metric to
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---allow all workers to sync their counters.
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---@param label_values string[] The number of label values should match the number of label names defined when the counter was registered using `prometheus:counter()`. No label values should be provided for counters with no labels. Non-printable characters will be stripped from label values.
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function PrometheusCounter:del(label_values) end
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---Delete all metrics for a previously registered counter.
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---If this counter have no labels, it is just the same as `Counter:del()` function.
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---If this counter have labels, it will delete all the metrics with different label values.
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---
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---This function will wait for `sync_interval` before deleting the metrics to allow all workers to sync their counters.
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function PrometheusCounter:reset() end
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---@class PrometheusGauge
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local PrometheusGauge = {}
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---Sets the current value of a previously registered gauge.
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---This could be called from
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---[log_by_lua_block](https://github.com/openresty/lua-nginx-module#log_by_lua_block)
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---globally or per server/location to modify a gauge on each request, or from
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---[content_by_lua_block](https://github.com/openresty/lua-nginx-module#content_by_lua_block)
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---just before `prometheus::collect()` to return a real-time value.
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---
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---@param value number is a value that the gauge should be set to. Required.
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---@param label_values? string[] is an array of label values.
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function PrometheusGauge:set(value, label_values) end
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---Increments a previously registered gauge.
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---This is usually called from log_by_lua_block globally or per server/location.
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---
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---The number of label values should match the number of label names
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---defined when the gauge was registered using `prometheus:gauge()`.
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---No label values should be provided for gauge with no labels.
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---Non-printable characters will be stripped from label values.
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---@param value number is a value that should be added to the gauge. Defaults to 1.
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---@param label_values? string[] is an array of label values.
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function PrometheusGauge:inc(value, label_values) end
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---Delete a previously registered gauge.
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---This is usually called when you don't need to observe such gauge
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---(or a metric with specific label values in this gauge) any more.
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---If this gauge has labels, you have to pass `label_values` to delete
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---the specific metric of this gauge.
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---If you want to delete all the metrics of a gauge with labels,
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---you should call `Gauge:reset()`.
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---
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---This function will wait for sync_interval before deleting the metric to
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---allow all workers to sync their counters.
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---@param label_values string[] The number of label values should match the number of label names defined when the gauge was registered using `prometheus:gauge()`. No label values should be provided for counters with no labels. Non-printable characters will be stripped from label values.
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function PrometheusGauge:del(label_values) end
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---Delete all metrics for a previously registered gauge.
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---If this gauge have no labels, it is just the same as `Gauge:del()` function.
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---If this gauge have labels, it will delete all the metrics with different
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---label values.
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function PrometheusGauge:reset() end
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---@class PrometheusHist
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local PrometheusHist = {}
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---Records a value in a previously registered histogram.
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---Usually called from
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---[log_by_lua_block](https://github.com/openresty/lua-nginx-module#log_by_lua_block)
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---globally or per server/location.
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---
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---Example:
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---```
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---log_by_lua_block {
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--- metric_latency:observe(tonumber(ngx.var.request_time), {ngx.var.server_name})
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--- metric_response_sizes:observe(tonumber(ngx.var.bytes_sent))
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---}
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---```
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---@param value string is a value that should be recorded. Required.
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---@param label_values? string[] is an array of label values.
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function PrometheusHist:observe(value, label_values) end
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---Delete all metrics for a previously registered histogram.
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---
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---This function will wait for `sync_interval` before deleting the
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---metrics to allow all workers to sync their counters.
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function PrometheusHist:reset() end
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return PrometheusLib
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