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diff --git a/resources/tools/dash/app/pal/utils/constants.py b/resources/tools/dash/app/pal/utils/constants.py
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+# Copyright (c) 2022 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Constants used in Dash PAL.
+
+"Constant" means a value that keeps its value since initialization. The value
+does not need to be hard coded here, but can be read from environment variables.
+"""
+
+
+import dash_bootstrap_components as dbc
+
+from dash import html
+
+
+class Constants:
+    """Constants used in Dash PAL.
+    """
+
+    ############################################################################
+    # General, application wide constants.
+
+    # The application title.
+    TITLE = "FD.io CSIT"
+
+    # The application description.
+    DESCRIPTION = "Performance Dashboard"
+
+    # External stylesheets.
+    EXTERNAL_STYLESHEETS = [dbc.themes.LUX, ]
+
+    # Top level template for all pages.
+    TEMPLATE = "d-flex h-100 text-center text-white bg-dark"
+
+    # Path and name of the file specifying the HTML layout of the dash
+    # application.
+    MAIN_HTML_LAYOUT_FILE = "index_layout.jinja2"
+
+    # Application root.
+    APPLICATIN_ROOT = "/"
+
+    # Data to be downloaded from the parquets specification file.
+    DATA_SPEC_FILE = "pal/data/data.yaml"
+
+    # The file with tooltips.
+    TOOLTIP_FILE = "pal/utils/tooltips.yaml"
+
+    # Maximal value of TIME_PERIOD for data read from the parquets in days.
+    # Do not change without a good reason.
+    MAX_TIME_PERIOD = 180
+
+    # It defines the time period for data read from the parquets in days from
+    # now back to the past.
+    # TIME_PERIOD = None - means all data (max MAX_TIME_PERIOD days) is read.
+    # TIME_PERIOD = MAX_TIME_PERIOD - is the default value
+    TIME_PERIOD = MAX_TIME_PERIOD  # [days]
+
+    # List of releases used for iterative data processing.
+    # The releases MUST be in the order from the current (newest) to the last
+    # (oldest).
+    RELEASES = ["csit2206", "csit2202", ]
+
+    ############################################################################
+    # General, application wide, layout affecting constants.
+
+    # If True, clear all inputs in control panel when button "ADD SELECTED" is
+    # pressed.
+    CLEAR_ALL_INPUTS = False
+
+    # The element is disabled.
+    STYLE_DISABLED = {"display": "none"}
+
+    # The element is enabled and visible.
+    STYLE_ENABLED = {"display": "inherit"}
+
+    # Checklist "All" is disabled.
+    CL_ALL_DISABLED = [
+        {
+            "label": "All",
+            "value": "all",
+            "disabled": True
+        }
+    ]
+
+    # Checklist "All" is enable, visible and unchecked.
+    CL_ALL_ENABLED = [
+        {
+            "label": "All",
+            "value": "all",
+            "disabled": False
+        }
+    ]
+
+    # Placeholder for any element in the layout.
+    PLACEHOLDER = html.Nobr("")
+
+    # List of drivers used in CSIT.
+    DRIVERS = ("avf", "af-xdp", "rdma", "dpdk")
+
+    # Labels for input elements (dropdowns, ...).
+    LABELS = {
+        "dpdk": "DPDK",
+        "container_memif": "LXC/DRC Container Memif",
+        "crypto": "IPSec IPv4 Routing",
+        "ip4": "IPv4 Routing",
+        "ip6": "IPv6 Routing",
+        "ip4_tunnels": "IPv4 Tunnels",
+        "l2": "L2 Ethernet Switching",
+        "srv6": "SRv6 Routing",
+        "vm_vhost": "VMs vhost-user",
+        "nfv_density-dcr_memif-chain_ipsec": "CNF Service Chains Routing IPSec",
+        "nfv_density-vm_vhost-chain_dot1qip4vxlan":"VNF Service Chains Tunnels",
+        "nfv_density-vm_vhost-chain": "VNF Service Chains Routing",
+        "nfv_density-dcr_memif-pipeline": "CNF Service Pipelines Routing",
+        "nfv_density-dcr_memif-chain": "CNF Service Chains Routing",
+    }
+
+    # URL style.
+    URL_STYLE = {
+        "background-color": "#d2ebf5",
+        "border-color": "#bce1f1",
+        "color": "#135d7c"
+    }
+
+    ############################################################################
+    # General, normalization constants.
+
+    NORM_FREQUENCY = 2.0  # [GHz]
+    FREQUENCY = {  # [GHz]
+        "2n-aws": 1.000,
+        "2n-dnv": 2.000,
+        "2n-clx": 2.300,
+        "2n-icx": 2.600,
+        "2n-skx": 2.500,
+        "2n-tx2": 2.500,
+        "2n-zn2": 2.900,
+        "3n-alt": 3.000,
+        "3n-aws": 1.000,
+        "3n-dnv": 2.000,
+        "3n-icx": 2.600,
+        "3n-skx": 2.500,
+        "3n-tsh": 2.200
+    }
+
+    ############################################################################
+    # General, plots constants.
+
+    PLOT_COLORS = (
+        "#1A1110", "#DA2647", "#214FC6", "#01786F", "#BD8260", "#FFD12A",
+        "#A6E7FF", "#738276", "#C95A49", "#FC5A8D", "#CEC8EF", "#391285",
+        "#6F2DA8", "#FF878D", "#45A27D", "#FFD0B9", "#FD5240", "#DB91EF",
+        "#44D7A8", "#4F86F7", "#84DE02", "#FFCFF1", "#614051"
+    )
+
+    # Trending, anomalies.
+    ANOMALY_COLOR = {
+        "regression": 0.0,
+        "normal": 0.5,
+        "progression": 1.0
+    }
+
+    COLORSCALE_TPUT = [
+        [0.00, "red"],
+        [0.33, "red"],
+        [0.33, "white"],
+        [0.66, "white"],
+        [0.66, "green"],
+        [1.00, "green"]
+    ]
+
+    TICK_TEXT_TPUT = ["Regression", "Normal", "Progression"]
+
+    COLORSCALE_LAT = [
+        [0.00, "green"],
+        [0.33, "green"],
+        [0.33, "white"],
+        [0.66, "white"],
+        [0.66, "red"],
+        [1.00, "red"]
+    ]
+
+    TICK_TEXT_LAT = ["Progression", "Normal", "Regression"]
+
+    # Access to the results.
+    VALUE = {
+        "mrr": "result_receive_rate_rate_avg",
+        "ndr": "result_ndr_lower_rate_value",
+        "pdr": "result_pdr_lower_rate_value",
+        "pdr-lat": "result_latency_forward_pdr_50_avg"
+    }
+
+    VALUE_ITER = {
+        "mrr": "result_receive_rate_rate_values",
+        "ndr": "result_ndr_lower_rate_value",
+        "pdr": "result_pdr_lower_rate_value",
+        "pdr-lat": "result_latency_forward_pdr_50_avg"
+    }
+
+    UNIT = {
+        "mrr": "result_receive_rate_rate_unit",
+        "ndr": "result_ndr_lower_rate_unit",
+        "pdr": "result_pdr_lower_rate_unit",
+        "pdr-lat": "result_latency_forward_pdr_50_unit"
+    }
+
+    # Latencies.
+    LAT_HDRH = (  # Do not change the order
+        "result_latency_forward_pdr_0_hdrh",
+        "result_latency_reverse_pdr_0_hdrh",
+        "result_latency_forward_pdr_10_hdrh",
+        "result_latency_reverse_pdr_10_hdrh",
+        "result_latency_forward_pdr_50_hdrh",
+        "result_latency_reverse_pdr_50_hdrh",
+        "result_latency_forward_pdr_90_hdrh",
+        "result_latency_reverse_pdr_90_hdrh",
+    )
+
+    # This value depends on latency stream rate (9001 pps) and duration (5s).
+    # Keep it slightly higher to ensure rounding errors to not remove tick mark.
+    PERCENTILE_MAX = 99.999501
+
+    GRAPH_LAT_HDRH_DESC = {
+        "result_latency_forward_pdr_0_hdrh": "No-load.",
+        "result_latency_reverse_pdr_0_hdrh": "No-load.",
+        "result_latency_forward_pdr_10_hdrh": "Low-load, 10% PDR.",
+        "result_latency_reverse_pdr_10_hdrh": "Low-load, 10% PDR.",
+        "result_latency_forward_pdr_50_hdrh": "Mid-load, 50% PDR.",
+        "result_latency_reverse_pdr_50_hdrh": "Mid-load, 50% PDR.",
+        "result_latency_forward_pdr_90_hdrh": "High-load, 90% PDR.",
+        "result_latency_reverse_pdr_90_hdrh": "High-load, 90% PDR."
+    }
+
+    ############################################################################
+    # News.
+
+    # The pathname prefix for the application.
+    NEWS_ROUTES_PATHNAME_PREFIX = "/news/"
+
+    # Path and name of the file specifying the HTML layout of the dash
+    # application.
+    NEWS_HTML_LAYOUT_FILE = "pal/templates/news_layout.jinja2"
+
+    # The default job displayed when the page is loaded first time.
+    NEWS_DEFAULT_JOB = "csit-vpp-perf-mrr-daily-master-2n-icx"
+
+    # Time period for regressions and progressions.
+    NEWS_TIME_PERIOD = 21  # [days]
+
+    ############################################################################
+    # Report.
+
+    # The pathname prefix for the application.
+    REPORT_ROUTES_PATHNAME_PREFIX = "/report/"
+
+    # Path and name of the file specifying the HTML layout of the dash
+    # application.
+    REPORT_HTML_LAYOUT_FILE = "pal/templates/report_layout.jinja2"
+
+    # Layout of plot.ly graphs.
+    REPORT_GRAPH_LAYOUT_FILE = "pal/report/layout.yaml"
+
+    ############################################################################
+    # Statistics.
+
+    # The pathname prefix for the application.
+    STATS_ROUTES_PATHNAME_PREFIX = "/stats/"
+
+    # Path and name of the file specifying the HTML layout of the dash
+    # application.
+    STATS_HTML_LAYOUT_FILE = "pal/templates/stats_layout.jinja2"
+
+    # Layout of plot.ly graphs.
+    STATS_GRAPH_LAYOUT_FILE = "pal/stats/layout.yaml"
+
+    # The default job displayed when the page is loaded first time.
+    STATS_DEFAULT_JOB = "csit-vpp-perf-mrr-daily-master-2n-icx"
+
+    ############################################################################
+    # Trending.
+
+    # The pathname prefix for the application.
+    TREND_ROUTES_PATHNAME_PREFIX = "/trending/"
+
+    # Path and name of the file specifying the HTML layout of the dash
+    # application.
+    TREND_HTML_LAYOUT_FILE = "pal/templates/trending_layout.jinja2"
+
+    # Layout of plot.ly graphs.
+    TREND_GRAPH_LAYOUT_FILE = "pal/trending/layout.yaml"