Telemetry

Hiku exposes several prometheus metrics.

Graph execution time metrics

Shows the time spent in the graph execution for each Field or Link.

You can enable graph execution time metrics like this:

from hiku.telemetry import GraphMetrics
from hiku.graph import Graph, Field, Root

GRAPH = Graph([
    Root([
        Field('value', String, value_func),
    ]),
])

metrics = GraphMetrics('mobile', metric=mobile_graph_metrics)
GRAPH = metrics.visit(GRAPH)

Where:

• mobile - is a graph label (in case you have multiple graphs in your app)

• metric - is your custom Summary metric. If not provided, the default Summary(‘graph_field_time’) is used

Default metric:

Summary(
    'graph_field_time',
    'Graph field time (seconds)',
    ['graph', 'node', 'field'],
)

Query cache metrics

It is possible to enable query cache. That means that the same query will be parsed only once.

When query cache is enabled, the following metrics are exposed:

Gauge('hiku_query_cache_hits', 'Query cache hits')
Gauge('hiku_query_cache_misses', 'Query cache misses')