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capsul-flask
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comments and error handling on metrics

This commit is contained in:
forest 2020-05-13 00:49:08 -05:00
parent 17159ddbf3
commit df156181b4
1 changed files with 10 additions and 6 deletions
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16
capsulflask/metrics.py
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@ -81,6 +81,7 @@ def get_plot_bytes(metric, capsulid, duration, size):
if interval_seconds < 30:
interval_seconds = 30
# Prometheus queries to pull metrics for VMs
metric_queries = dict(
cpu=f"irate(libvirtd_domain_info_cpu_time_seconds_total{{domain='{capsulid}'}}[30s])",
memory=f"libvirtd_domain_info_memory_usage_bytes{{domain='{capsulid}'}}",
@ -89,12 +90,14 @@ def get_plot_bytes(metric, capsulid, duration, size):
disk=f"rate(libvirtd_domain_block_stats_read_bytes_total{{domain='{capsulid}'}}[{interval_seconds}s])%2Brate(libvirtd_domain_block_stats_write_bytes_total{{domain='{capsulid}'}}[{interval_seconds}s])",
)
# These represent the top of the graph for graphs that are designed to be viewed at a glance.
# they are also used to colorize the graph at any size.
scales = dict(
cpu=vm["vcpus"],
memory=vm["memory_mb"]*1024*1024,
network_in=1024*1024*2,
network_out=1024*200,
disk=1024*1024*2,
disk=1024*1024*4,
)
if metric not in metric_queries:
@ -110,19 +113,20 @@ def get_plot_bytes(metric, capsulid, duration, size):
if prometheus_response.status_code >= 300:
return (502, None)
if len(prometheus_response.json()["data"]["result"]) == 0:
return (404, None)
time_series_data = list(map(
lambda x: (datetime.fromtimestamp(x[0]), float(x[1])),
prometheus_response.json()["data"]["result"][0]["values"]
))
plot_bytes = draw_plot_bytes(time_series_data, scale=scales[metric], size_x=sizes[size][0], size_y=sizes[size][1])
plot_bytes = draw_plot_png_bytes(time_series_data, scale=scales[metric], size_x=sizes[size][0], size_y=sizes[size][1])
return (200, plot_bytes)
def draw_plot_bytes(data, scale, size_x=3, size_y=1):
def draw_plot_png_bytes(data, scale, size_x=3, size_y=1):
pyplot.style.use("seaborn-dark")
fig, my_plot = pyplot.subplots(figsize=(size_x, size_y))
@ -156,7 +160,7 @@ def draw_plot_bytes(data, scale, size_x=3, size_y=1):
hours = minutes/float(60)
days = hours/float(24)
day_locator = mdates.WeekdayLocator()
week_locator = mdates.WeekdayLocator()
minute_locator = mdates.MinuteLocator()
ten_minute_locator = mdates.MinuteLocator(interval=10)
hour_locator = mdates.HourLocator(interval=6)
@ -173,7 +177,7 @@ def draw_plot_bytes(data, scale, size_x=3, size_y=1):
my_plot.xaxis.set_major_locator(hour_locator)
my_plot.xaxis.set_major_formatter(hour_minute_formatter)
else:
my_plot.xaxis.set_major_locator(day_locator)
my_plot.xaxis.set_major_locator(week_locator)
my_plot.xaxis.set_major_formatter(day_formatter)
max_value = reduce(lambda a, b: a if a > b else b, y, scale)