Module agora.stats.CollectorRegistry

Contains a collection of prometheus stat collectors that acts as an interface between the response handler, and stat collectors from every individual metric and label set.

auto stats = new ExampleStats();
auto registry = new CollectorRegistry([&stats.collectDg1]);

stats.setTestStats(Statistics(3600, 347, 3.14, 6.023, 0.43));

assert(registry.collect().startsWith(
    "up_time_s {id=\"123.034\"} 3600\ncount {id=\"123.034\"} 347\n" ~
    "ratio {id=\"123.034\"} 3.14\nfraction {id=\"123.034\"} 6.023\n" ~
    "very_real {id=\"123.034\"} 0.43\n"));

auto stats = new ExampleStats();
auto registry = new CollectorRegistry([&stats.collectDg1]);
registry.addCollector(&stats.collectDg2);

stats.setTestStats(Statistics(3600, 347, 3.14, 6.023, 0.43));
stats.setTestLabels(Labels(1_235_813, "ocean", 3.14159));

assert(registry.collect().startsWith(
    "up_time_s {id=\"123.034\"} 3600\ncount {id=\"123.034\"} 347\n" ~
    "ratio {id=\"123.034\"} 3.14\nfraction {id=\"123.034\"} 6.023\n" ~
    "very_real {id=\"123.034\"} 0.43\n" ~

    "up_time_s {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 3600\n" ~
    "count {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 347\n" ~
    "ratio {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 3.14\n" ~
    "fraction {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 6.023\n" ~
    "very_real {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 0.43\n"));

auto stats = new ExampleStats();
auto registry = new CollectorRegistry([&stats.collectDg2]);

stats.setTestStats(Statistics(3600, 347, 3.14, 6.023, 0.43));
stats.setTestLabels(Labels(1_235_813, "ocean", 3.14159));

auto collected = registry.collect();

// Update the stats
stats.setTestStats(Statistics(4200, 257, 2.345, 1.098, 0.56));

// A 2nd call to `collect` should return the updated stats, without the
// previous values anywhere in it.
assert(registry.collect(),
    "up_time_s {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 4200\n" ~
    "count {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 257\n" ~
    "ratio {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 2.345\n" ~
    "fraction {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 1.098\n" ~
    "very_real {id=\"1235813\",job=\"ocean\",perf=\"3.14159\"} 0.56\n");